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Ceratozamia Stock Photos and Images
RF2P11M2P–Ceratozamia mexicana is a species of plant in the family Zamiaceae. Cycad with dark green foliage
RFT601H2–Ceratozamia Mexicana is known as Mexican Horncone. It is an evergreen plant, vintage line drawing or engraving illustration.
RF2G5NH0F–The fruit of Ceratozamia mexicana , a species of plant in the family Zamiaceae. It is found in southeastern Costa Rica, Panama and Mexico
RMW27RT2–Archive image from page 312 of Cyclopedia of American horticulture, comprising. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches cyclopediaofam01bail Year: 1900 CEEASTIUM Boissirli, Gren. Low: Ivs. silvery, ovate-lanceolate, acute, entire, sessile; peduncles 4-12 in. high : inflores- cence a dichotomous cymt CERATOZAMIA 277 3-./ -) --= 410 Cerastu tomentdsum, Linn. L
RM2AJ3TAF–Recueil des travaux botaniques néerlandais . Fig. 1. Macrozamia corallipes; seed seen from above, § 18. Ceratozamia mexicana Brongn.Material: Garden Maastricht *.In gênerai shape and organization the seed resemblesthat of Encephalartos and Macrozamia..
RMPG2KFC–. Morphology of gymnosperms. Gymnosperms; Plant morphology. ii8 MORPHOLOGY OF GYMNOSPERMS ened, and the layers between the epidermis and the spores disorganize, as in the sporangia of ferns. Two rows of elongated thin-walled cells bordered by cells with thick walls give the de- hiscence much the appear- ance of that of Angiopteris. The formation of micro- spores from the mother cell has been described by JtiRANYi (5) and by Miss F. Grace Smith (56) for Ceratozamia, and by Teetjb (11) for Zamia muricata. With the appearance of the cell plate in the first divi- sion, a ringlike thickening of cel
RF2P11KY1–Ceratozamia mexicana is a species of plant in the family Zamiaceae. Cycad with dark green foliage
RF2DGK5X3–The fruit of Ceratozamia mexicana , a species of plant in the family Zamiaceae. It is found in southeastern Costa Rica, Panama and Mexico
RMW27T3H–Archive image from page 313 of Cyclopedia of American horticulture, comprising. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches cyclopediaofam01bail Year: 1900 278 CERATOZAMIA CERCOCAKPUS long or more, lanceolate : cones produced annually on separate plants; female cones 9-12 in. long, 4-6 in. thick, the scales 2-horned ; male cones narrower, longer, on a hairy stalk, t
RM2CHE6CR–. The standard cyclopedia of horticulture; a discussion, for the amateur, and the professional and commercial grower, of the kinds, characteristics and methods of cultivation of the species of plants grown in the regions of the United States and Canada for ornament, for fancy, for fruit and for vegetables; with keys to the natural families and genera, descriptions of the horticultural capabilities of the states and provinces and dependent islands, and sketches of eminent horticulturists . 880. Ceratozamia mexicana.—Young plant (fertile). 720 CERCIDIPHYLLUM C^.RCIS
RMPG2KJ2–. Morphology of gymnosperms. Gymnosperms; Plant morphology. CYCADALES lOI nected with the central cylinder (fig. 79). There is no girdling of leaf traces in the younger stages, the traces being at first vertical; but with the radial increase of the inclosed leaves and stem tip girdling becomes apparent. The xylem of the leaf traces is endarch, but it becomes mesarch in the base of the leaf and remains so to the tips of the pinnae. In a later study (66) the extrafascicular cambium of the seedling of Ceratozamia was investigated. In over eighty seed- lings, ranging in age from a few months to ov
RF2F9KNWF–The fruit of Ceratozamia mexicana , a species of plant in the family Zamiaceae. It is found in southeastern Costa Rica, Panama and Mexico
RMW0RC4D–Archive image from page 364 of Der baum (1860). Der baum derbaum00scha Year: 1860 Wur/.olwnclioiiinon. 173 Schlamme kriecht, sohciueii sie sich vorzugsweise zu entwickeln. Auch den Leguminosen, z. B. der Lupine und den Klee-Arten, sind älinliche Auschwelhingen der Wurzel eigen, welche in der eigenthinnlichsten Weise bei den Uber die Erde hervorwachsenden Wurzeln der Cycadeen. auftreten. Bei Ceratozamia muricata sind es lange, wenig verzweigte Wurzeln, welche Fig. 124. Fig. 125. reihenweise kurze, sternförmig verzweigte Seitenwurzeln ausschicken; bei Ceratozomia mexicana verzweigen sich die
RM2CHE5D6–. The standard cyclopedia of horticulture; a discussion, for the amateur, and the professional and commercial grower, of the kinds, characteristics and methods of cultivation of the species of plants grown in the regions of the United States and Canada for ornament, for fancy, for fruit and for vegetables; with keys to the natural families and genera, descriptions of the horticultural capabilities of the states and provinces and dependent islands, and sketches of eminent horticulturists . 880. Ceratozamia mexicana.—Young plant (fertile). 720 CERCIDIPHYLLUM C^.RCIS. 881. Cercidiphyllum japonicu
![. Morphology of gymnosperms. Gymnosperms; Plant morphology. CYCADALES lOS fusion of its cotyledons. They arise as two distinct organs, but in the older embryos the fusion is so complete that serial sections from the apex down- ward almost to the apex of the plumule do not reveal the characteristic "seam," in many cases the abutting epidermal layers having disappeared. As in Ceratozamia, there is no "resting stage" of the embryo, which emerges from the testa as soon as it is formed. In Ceratozamia, Dioon, Micro- cycas, and Zamia, and pre- sumably in other cycads, the root is Stock Photo](https://c8.alamy.com/comp/PG2KHM/morphology-of-gymnosperms-gymnosperms-plant-morphology-cycadales-los-fusion-of-its-cotyledons-they-arise-as-two-distinct-organs-but-in-the-older-embryos-the-fusion-is-so-complete-that-serial-sections-from-the-apex-down-ward-almost-to-the-apex-of-the-plumule-do-not-reveal-the-characteristic-quotseamquot-in-many-cases-the-abutting-epidermal-layers-having-disappeared-as-in-ceratozamia-there-is-no-quotresting-stagequot-of-the-embryo-which-emerges-from-the-testa-as-soon-as-it-is-formed-in-ceratozamia-dioon-micro-cycas-and-zamia-and-pre-sumably-in-other-cycads-the-root-is-PG2KHM.jpg ". Morphology of gymnosperms. Gymnosperms; Plant morphology. CYCADALES lOS fusion of its cotyledons. They arise as two distinct organs, but in the older embryos the fusion is so complete that serial sections from the apex down- ward almost to the apex of the plumule do not reveal the characteristic "seam," in many cases the abutting epidermal layers having disappeared. As in Ceratozamia, there is no "resting stage" of the embryo, which emerges from the testa as soon as it is formed. In Ceratozamia, Dioon, Micro- cycas, and Zamia, and pre- sumably in other cycads, the root is Stock Photo")
RMPG2KHM–. Morphology of gymnosperms. Gymnosperms; Plant morphology. CYCADALES lOS fusion of its cotyledons. They arise as two distinct organs, but in the older embryos the fusion is so complete that serial sections from the apex down- ward almost to the apex of the plumule do not reveal the characteristic "seam," in many cases the abutting epidermal layers having disappeared. As in Ceratozamia, there is no "resting stage" of the embryo, which emerges from the testa as soon as it is formed. In Ceratozamia, Dioon, Micro- cycas, and Zamia, and pre- sumably in other cycads, the root is
RF2G8F3M2–The fruit of Ceratozamia mexicana , a species of plant in the family Zamiaceae. It is found in southeastern Costa Rica, Panama and Mexico
![Archive image from page 81 of Das Leben der Pflanze (1906). Das Leben der Pflanze daslebenderpflan04fran Year: 1906 {2 5)ic garnpalmcn. 3?c[onbcr§ incrfiuürbig finb bic ftet§ etngc]'d)tecf)tigen S3lüten, bcnen S3lumen= blattet üöflig abgcfjen. 2)ic männli(f)cn erinnern ftnrf an bie apfn ' 3abelbäume unb licitlen nurfi )'o. 2)ic meiblirficn iPIumenbInttcr finb am 6nbe be§ 6tannne§ (fo bei Ceratozamia [fiele 23ilbJ) audfj äopfenförmtg, mei[t aber lüeicfje, bidt brauniüoUige, gefieberte Slätter. 2)ann trogen |ie einige Samenonlogen, bie offen boliegen ober — im gofle äopfenortiger, meiblider Sl Stock Photo](https://c8.alamy.com/comp/W1RX1T/archive-image-from-page-81-of-das-leben-der-pflanze-1906-das-leben-der-pflanze-daslebenderpflan04fran-year-1906-2-5ic-garnpalmcn-3c-onbcr-incrfiurbig-finb-bic-ftet-etngc-dtecftigen-s3lten-bcnen-s3lumen=-blattet-flig-abgcfjen-2ic-mnnlifcn-erinnern-ftnrf-an-bie-apfn-3abelbume-unb-licitlen-nurfi-o-2ic-meiblirficn-ipiumenbinttcr-finb-am-6nbe-be-6tannne-fo-bei-ceratozamia-fiele-23ilbj-audfj-opfenfrmtg-mei-t-aber-leicfje-bidt-brauniouige-gefieberte-sltter-2ann-trogen-ie-einige-samenonlogen-bie-offen-boliegen-ober-im-gofle-opfenortiger-meiblider-sl-W1RX1T.jpg "Archive image from page 81 of Das Leben der Pflanze (1906). Das Leben der Pflanze daslebenderpflan04fran Year: 1906 {2 5)ic garnpalmcn. 3?c[onbcr§ incrfiuürbig finb bic ftet§ etngc]'d)tecf)tigen S3lüten, bcnen S3lumen= blattet üöflig abgcfjen. 2)ic männli(f)cn erinnern ftnrf an bie apfn ' 3abelbäume unb licitlen nurfi )'o. 2)ic meiblirficn iPIumenbInttcr finb am 6nbe be§ 6tannne§ (fo bei Ceratozamia [fiele 23ilbJ) audfj äopfenförmtg, mei[t aber lüeicfje, bidt brauniüoUige, gefieberte Slätter. 2)ann trogen |ie einige Samenonlogen, bie offen boliegen ober — im gofle äopfenortiger, meiblider Sl Stock Photo")
RMW1RX1T–Archive image from page 81 of Das Leben der Pflanze (1906). Das Leben der Pflanze daslebenderpflan04fran Year: 1906 {2 5)ic garnpalmcn. 3?c[onbcr§ incrfiuürbig finb bic ftet§ etngc]'d)tecf)tigen S3lüten, bcnen S3lumen= blattet üöflig abgcfjen. 2)ic männli(f)cn erinnern ftnrf an bie apfn ' 3abelbäume unb licitlen nurfi )'o. 2)ic meiblirficn iPIumenbInttcr finb am 6nbe be§ 6tannne§ (fo bei Ceratozamia [fiele 23ilbJ) audfj äopfenförmtg, mei[t aber lüeicfje, bidt brauniüoUige, gefieberte Slätter. 2)ann trogen |ie einige Samenonlogen, bie offen boliegen ober — im gofle äopfenortiger, meiblider Sl
RM2CEN5T2–. The classification of flowering plants. (fig. 5, D). The nucellar tissue between the pollen-chamber and the embryo-sac becomes soft and loose, andultimately disorganised, forming a cavity. 54 FLOWERING PLANTS [CH. In Ceratozamia and Stangeria, according to Treub^ andLang* respectively, the spore-mother-cell divides transversely into three cells (potential mega-spores), the lowest of which be-comes the functional megaspore,enlarging rapidly at the expenseof the others and adjacent cells.In Cycas the outer wall of themegaspore becomes cutinized. Fig. 6. Female cone of MacrozamiaPreissii, nat
RMPFN169–. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. CEEASTIUM Boissi^rli, Gren. Low: Ivs. silvery, ovate-lanceolate, acute, entire, sessile; peduncles 4-12 in. high : inflores- cence a dichotomous cymt CERATOZAMIA 277. ^^^ 3^-./^ -) --=^ 410 Cerastu tomentdsum, Linn. Low, creeping, branched: Ivs. ob- long, spatulate, grayish woolly, upper Ivs. lanceolate ; pedun
RF2DGK5XF–The fruit of Ceratozamia mexicana , a species of plant in the family Zamiaceae. It is found in southeastern Costa Rica, Panama and Mexico
RM2CDF2KM–. Allgemeine Pflanzenkaryologie . r Zamia), Cham-BEELAIN (1910a für Dioon, 1912a für Ceratozamia) wissen (vgl. auch dieZusammenstellung bei Coulter und Chamberlain 1910). Interessantist namentlich die genaue Schilderung der Kernvereinigung, die Ikenofür Cycas gab (Fig. 318). Der Eikern biegt sich darnach an derSpitze leicht ein, und an dem Teile des Nucleus, der den „Bodendieser Vertiefung überzieht, sieht man eine dichte feinkörnige Substanzsich ansammeln, wohl bedingt durch die starke Krümmung der Ober-fläche. So entsteht eine „Empfängnishöhle, in die der cf Nucleusimmer tiefer eindringt (a)
RMPG2KHX–. Morphology of gymnosperms. Gymnosperms; Plant morphology. I02 MORPHOLOGY OF GYMNOSPERMS. Mekn /? doreTy iel Fig. 78.—Ceratozamia mexicana: transverse section of hypocotyl slightly below exit of cotyledonary traces; the diagram shows the position of the stele, surrounded by three large groups of extrafascicular cambium (a, 6, s), and some smaller groups like e and r; the drawing shows a portion of the section indicated in the diagram, including one of the groups of extrafascicular cambium (a), parts of 6 and s, and also the smaller groups (e and ;-); the bundles of the stele are mesarch, with
RMREA49B–. Contributions from the Botanical Laboratory, vol. 7. Botany; Botany. 200 Seifriz gametophyte of the cycad Ceratozamia (Fig. 19), down to the smallest space which gives to chromatin material its reticular appearance. Chamberlain makes the fundamental statement that the largest and smallest vacuoles are of the same morphological nature, i. e., the vacuoles of the chromatin (from anaphase to late prophase of the next mitosis) are of the same nature as those of the cytoplasm, only much smaller. He adds that any theory of heredity which is based on a linear arragement of genes will have to be aba
RMPG2ACM–. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. CEEASTIUM Boissidrii, Gren. Low: Ivs. silvery, ovate-lanceolate, acute, entire, sessile; peduncles 4-12 in. high : inflores- cence a dichotomous cyme : fls. large, white. Spain. CERATOZAMIA 277. 410. Cerastium arvense. tomentdsum, Linn. Low, creeping, branched: Ivs. ob- long, spatulate, grayish woolly, upper Iv
![. Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. CTCADALBS 19 III. THE GAMETOPHYTES. THE FEMALE GAMETOPHYTE The gametophyte generation begins with the reduction divi- sion of the enlarged mother cell which lies deeply imbedded in the nucellus and surrounded by more or less sporogenous tissue which does not function as such. According to Treub ^^ and Lang,^® in Ceratozamia and Stangeria the transverse division of the mother cell results in a row of three cells (Fig. 19), which may be called potential megaspores, the lowest of which becomes the functional meg Stock Photo](https://c8.alamy.com/comp/RE2J02/morphology-of-spermatophytes-part-i-gymnosperms-gymnosperms-plant-morphology-ctcadalbs-19-iii-the-gametophytes-the-female-gametophyte-the-gametophyte-generation-begins-with-the-reduction-divi-sion-of-the-enlarged-mother-cell-which-lies-deeply-imbedded-in-the-nucellus-and-surrounded-by-more-or-less-sporogenous-tissue-which-does-not-function-as-such-according-to-treub-and-lang-in-ceratozamia-and-stangeria-the-transverse-division-of-the-mother-cell-results-in-a-row-of-three-cells-fig-19-which-may-be-called-potential-megaspores-the-lowest-of-which-becomes-the-functional-meg-RE2J02.jpg ". Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. CTCADALBS 19 III. THE GAMETOPHYTES. THE FEMALE GAMETOPHYTE The gametophyte generation begins with the reduction divi- sion of the enlarged mother cell which lies deeply imbedded in the nucellus and surrounded by more or less sporogenous tissue which does not function as such. According to Treub ^^ and Lang,^® in Ceratozamia and Stangeria the transverse division of the mother cell results in a row of three cells (Fig. 19), which may be called potential megaspores, the lowest of which becomes the functional meg Stock Photo")
RMRE2J02–. Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. CTCADALBS 19 III. THE GAMETOPHYTES. THE FEMALE GAMETOPHYTE The gametophyte generation begins with the reduction divi- sion of the enlarged mother cell which lies deeply imbedded in the nucellus and surrounded by more or less sporogenous tissue which does not function as such. According to Treub ^^ and Lang,^® in Ceratozamia and Stangeria the transverse division of the mother cell results in a row of three cells (Fig. 19), which may be called potential megaspores, the lowest of which becomes the functional meg
![. Fossil plants : for students of botany and geology . Paleobotany. XXVIII] REPRODFOTIVB SHOOTS 21. Fig. 392. A. Cycas pectinata, apex of megasporophyll. (f nat. size.) B, C. Cycas Riuminiana, megasporophyll. (J nat. size.) D. Eficephalartos AUensteinii. Distal end of megasporophyUs. (rrom the Gardeners' Chronicle.) E, F. Cycas angulata, miorosporophyll and sorus. G, I. Ceratozamia mexicana, I, microsporophyll with soars of sori (s); G, sorus. (After Thibout.) H. Stangeria paradoxa, megastrobilus.. Please note that these images are extracted from scanned page images that may have been digitall Stock Photo](https://c8.alamy.com/comp/PG14YP/fossil-plants-for-students-of-botany-and-geology-paleobotany-xxviii-reprodfotivb-shoots-21-fig-392-a-cycas-pectinata-apex-of-megasporophyll-f-nat-size-b-c-cycas-riuminiana-megasporophyll-j-nat-size-d-eficephalartos-auensteinii-distal-end-of-megasporophyus-rrom-the-gardeners-chronicle-e-f-cycas-angulata-miorosporophyll-and-sorus-g-i-ceratozamia-mexicana-i-microsporophyll-with-soars-of-sori-s-g-sorus-after-thibout-h-stangeria-paradoxa-megastrobilus-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitall-PG14YP.jpg ". Fossil plants : for students of botany and geology . Paleobotany. XXVIII] REPRODFOTIVB SHOOTS 21. Fig. 392. A. Cycas pectinata, apex of megasporophyll. (f nat. size.) B, C. Cycas Riuminiana, megasporophyll. (J nat. size.) D. Eficephalartos AUensteinii. Distal end of megasporophyUs. (rrom the Gardeners' Chronicle.) E, F. Cycas angulata, miorosporophyll and sorus. G, I. Ceratozamia mexicana, I, microsporophyll with soars of sori (s); G, sorus. (After Thibout.) H. Stangeria paradoxa, megastrobilus.. Please note that these images are extracted from scanned page images that may have been digitall Stock Photo")
RMPG14YP–. Fossil plants : for students of botany and geology . Paleobotany. XXVIII] REPRODFOTIVB SHOOTS 21. Fig. 392. A. Cycas pectinata, apex of megasporophyll. (f nat. size.) B, C. Cycas Riuminiana, megasporophyll. (J nat. size.) D. Eficephalartos AUensteinii. Distal end of megasporophyUs. (rrom the Gardeners' Chronicle.) E, F. Cycas angulata, miorosporophyll and sorus. G, I. Ceratozamia mexicana, I, microsporophyll with soars of sori (s); G, sorus. (After Thibout.) H. Stangeria paradoxa, megastrobilus.. Please note that these images are extracted from scanned page images that may have been digitall
![. Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. 14 MoHI'IlOLOdY OP SFEK:[AT0I'IIYTBS It is of iiitei-ortt to note that immerons stomata are found on the spovangiinu wall of Ceratozamia, EiiccpJiahnios, and Staii- qeria, and donbtlcss in other genera. They are fonnd on the wall which is oijposite to the slit of dehiscenceâthat is, toward the sporophyll. Stomata also occur npon pollen sacs of certain Angiospenns, hnt so far as recorded not upon the s])orangia of Pteridoplivtes. The d(''(do]inient of the sporangia, their large ont]nit (if spores, their arra Stock Photo](https://c8.alamy.com/comp/RE2J2W/morphology-of-spermatophytes-part-i-gymnosperms-gymnosperms-plant-morphology-14-mohiilolody-op-sfek-at0iiiytbs-it-is-of-iiitei-ortt-to-note-that-immerons-stomata-are-found-on-the-spovangiinu-wall-of-ceratozamia-eiiccpjiahnios-and-staii-qeria-and-donbtlcss-in-other-genera-they-are-fonnd-on-the-wall-which-is-oijposite-to-the-slit-of-dehiscencethat-is-toward-the-sporophyll-stomata-also-occur-npon-pollen-sacs-of-certain-angiospenns-hnt-so-far-as-recorded-not-upon-the-s-orangia-of-pteridoplivtes-the-ddo-inient-of-the-sporangia-their-large-ont-nit-if-spores-their-arra-RE2J2W.jpg ". Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. 14 MoHI'IlOLOdY OP SFEK:[AT0I'IIYTBS It is of iiitei-ortt to note that immerons stomata are found on the spovangiinu wall of Ceratozamia, EiiccpJiahnios, and Staii- qeria, and donbtlcss in other genera. They are fonnd on the wall which is oijposite to the slit of dehiscenceâthat is, toward the sporophyll. Stomata also occur npon pollen sacs of certain Angiospenns, hnt so far as recorded not upon the s])orangia of Pteridoplivtes. The d(''(do]inient of the sporangia, their large ont]nit (if spores, their arra Stock Photo")
RMRE2J2W–. Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. 14 MoHI'IlOLOdY OP SFEK:[AT0I'IIYTBS It is of iiitei-ortt to note that immerons stomata are found on the spovangiinu wall of Ceratozamia, EiiccpJiahnios, and Staii- qeria, and donbtlcss in other genera. They are fonnd on the wall which is oijposite to the slit of dehiscenceâthat is, toward the sporophyll. Stomata also occur npon pollen sacs of certain Angiospenns, hnt so far as recorded not upon the s])orangia of Pteridoplivtes. The d(''(do]inient of the sporangia, their large ont]nit (if spores, their arra
RMPG2KCJ–. Morphology of gymnosperms. Gymnosperms; Plant morphology. Figs. 128-131.—Diagrams of course of vascular bundles in sporophyll and ovule: fig. 128, Encephalartos villosus, course of bundles in megasporophyll; o, cf, </', three bundles passing to the ovule; fig. 129, small portion of the upper part of the ovule on a larger scale; fig. 130, Microcycas calocoma, vascular supply of ovule and sporo- phyll; fig. 131, Ceratozamia mexicana, vascular supply of ovule and sporophyll.— After Matte (40). little phloem, and when mesarch the development of centripetal xylem is very slight. The large cent
RMREA36P–. Contributions from the Hull Botanical Laboratory. Plants. 2l8 BOTANICAL GAZETTE [SEPTEMBER cortical cylinder will appear, is purely cortical. No differentiation is evident between stelar pericycle and cortex; there is even no endodermis, and therefore there is no ground here for believing that the supernumerary cylinders originate in the pericycle. In view of Sister Helen Angela's9 work with Ceratozamia, in which she found unquestionable cambiums at any place in the cortex from the stele to the periphery, it would be possible for the super- numerary cylinders of Cycas to originate in the cor
RMPG2KA8–. Morphology of gymnosperms. Gymnosperms; Plant morphology. CYCADALES 147 tube; but in Microcycas Caldwell (52) describes and figures sixteen to twenty sperms (figs. 174, 175), and four sperms are found occa- sionally in Ceratozamia (53). It is evident that in Microcycas the body cell has given rise to eight or ten spermatogenous cells, each of which has produced two sperms. Cupressus Goveniana, described. Figs. 174, 175.—Microcycas calocoma: fig. 174, pollen tube showing nine sperma- togenous cells, in most of which the blepharoplasts are seen; X160; fig. 175, later stage showing sections of
![. Contributions from the Botanical Laboratory, vol. 7. Botany; Botany. Fig. 19. Egg cell of Ceratozamia show- ing the highly vacuolate structure of the protoplasm. [From a publication by Dr. CHAMBERLAIN (11) and pubhshed with his kind permission.] The alveolar structure of protoplasm 201 Whether chromatin and linin are one and the same substance, i. e., the dispersion medium of an emulsion, or, whether they are distinct sub-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrati Stock Photo](https://c8.alamy.com/comp/REA498/contributions-from-the-botanical-laboratory-vol-7-botany-botany-fig-19-egg-cell-of-ceratozamia-show-ing-the-highly-vacuolate-structure-of-the-protoplasm-from-a-publication-by-dr-chamberlain-11-and-pubhshed-with-his-kind-permission-the-alveolar-structure-of-protoplasm-201-whether-chromatin-and-linin-are-one-and-the-same-substance-i-e-the-dispersion-medium-of-an-emulsion-or-whether-they-are-distinct-sub-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrati-REA498.jpg ". Contributions from the Botanical Laboratory, vol. 7. Botany; Botany. Fig. 19. Egg cell of Ceratozamia show- ing the highly vacuolate structure of the protoplasm. [From a publication by Dr. CHAMBERLAIN (11) and pubhshed with his kind permission.] The alveolar structure of protoplasm 201 Whether chromatin and linin are one and the same substance, i. e., the dispersion medium of an emulsion, or, whether they are distinct sub-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrati Stock Photo")
RMREA498–. Contributions from the Botanical Laboratory, vol. 7. Botany; Botany. Fig. 19. Egg cell of Ceratozamia show- ing the highly vacuolate structure of the protoplasm. [From a publication by Dr. CHAMBERLAIN (11) and pubhshed with his kind permission.] The alveolar structure of protoplasm 201 Whether chromatin and linin are one and the same substance, i. e., the dispersion medium of an emulsion, or, whether they are distinct sub-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrati
RMPFM3MJ–. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. CERASTIUM CERATOZAMIA 277 BoissiSrii, Gren. Low: Ivs. silvery, ovate-lanceolate, acute, entire, sessile; peduncles 4-12 in. high : inflores- cence a dichotomous cyme : fls. large, white. Spain.. 410. Cerastium arvense. tomentosum, Linn. Low, creeping, branched: Ivs. ob- long, spatulate, grayish woolly, upper Iv
RMRDG94J–. Morphology of gymnosperms. Gymnosperms; Plant morphology. ii8 MORPHOLOGY OF GYMNOSPERMS ened, and the layers between the epidermis and the spores disorganize, as in the sporangia of ferns. Two rows of elongated thin-walled cells bordered by cells with thick walls give the de- hiscence much the appear- ance of that of Angiopteris. The formation of micro- spores from the mother cell has been described by JtiRANYi (5) and by Miss F. Grace Smith (56) for Ceratozamia, and by Teetjb (11) for Zamia muricata. With the appearance of the cell plate in the first divi- sion, a ringlike thickening of cel
RMPFJJ8X–. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches, and a synopsis of the vegetable kingdom. Gardening -- Dictionaries; Plants -- North America encyclopedias. 278 CERATOZAMIA CERCOCARPUS long or more, lanceolate : cones produced annually on separate plants; female cones 9-12 in. long, 4-G in. thick, the scales 2-horned ; male cones narrower, longer, on a hairy stalk, the sc
RMRHB3FG–. Botanical gazette. Plants. 2l8 BOTANICAL GAZETTE [SEPTEMBER cortical cylinder will appear, is purely cortical. No differentiation is evident between stelar pericycle and cortex; there is even no endodermis, and therefore there is no ground here for believing that the supernumerary cylinders originate in the pericycle. In view of Sister Helen Angela's' work with Ceratozamia, in which she found unquestionable cambiums at any place in the cortex from the stele to the periphery, it would be possible for the super- numerary cyhnders of Cycas to originate in the cortex. In view of the evidence of
RMPFM3MH–. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 278 CERATOZAMIA CERCOCARPUS long or more, lanceolate : cones produced annually on separate plants; female cones 9-12 in. long, 4-6 in. thick, the scales 2-horned ; male cones narrower, longer, on a hairy stalk, the scales with two small teeth. Mes. Gn. 9, pp. 308, 309.â An excellent decorative plant, best grown
RMRDG974–. Morphology of gymnosperms. Gymnosperms; Plant morphology. CYCADALES lOI nected with the central cylinder (fig. 79). There is no girdling of leaf traces in the younger stages, the traces being at first vertical; but with the radial increase of the inclosed leaves and stem tip girdling becomes apparent. The xylem of the leaf traces is endarch, but it becomes mesarch in the base of the leaf and remains so to the tips of the pinnae. In a later study (66) the extrafascicular cambium of the seedling of Ceratozamia was investigated. In over eighty seed- lings, ranging in age from a few months to ov
RMPG1N43–. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 278 CERATOZAMIA CEKCOCABPUS long or more, lanceolate : cones produced annually on separate plants; female cones 9-12 in. long, 4-6 in. thick, the scales 2-horned ; male cones narrower, longer, on a hairy stalk, the scales with two small teeth. Mex. Gn. 9, pp. 308, 309.—An excellent decorative plant, best grown
RMRD5AF6–. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. CEEASTIUM Boissi^rli, Gren. Low: Ivs. silvery, ovate-lanceolate, acute, entire, sessile; peduncles 4-12 in. high : inflores- cence a dichotomous cymt CERATOZAMIA 277. ^^^ 3^-./^ -) --=^ 410 Cerastu tomentdsum, Linn. Low, creeping, branched: Ivs. ob- long, spatulate, grayish woolly, upper Ivs. lanceolate ; pedun
RMPG2KE8–. Morphology of gymnosperms. Gymnosperms; Plant morphology. Fig. 114.-—Megasporophylls of cycads: A, Cycas revoluta; B, Cycas circinalis; C, Cycas Normanbyana; D, Dioon edule; E, Encephalartos Preissii; F, Zamia integ- rijoKa; G, Ceratozamia mexicana.—A, after Sachs; C and F, after Von MulleR; E, after MiQUEL; F, after Richard; B, D, and G, drawn for Engler and Prantl's Nat. Pflanzenj., from which the entire plate is taken. is much more compact; while in the remaining genera the sporophylls show very little of the leaflike character and are organized into hard compact strobili (fig. 92). In Cy
RMRDG972–. Morphology of gymnosperms. Gymnosperms; Plant morphology. I02 MORPHOLOGY OF GYMNOSPERMS. Mekn /? doreTy iel Fig. 78.—Ceratozamia mexicana: transverse section of hypocotyl slightly below exit of cotyledonary traces; the diagram shows the position of the stele, surrounded by three large groups of extrafascicular cambium (a, 6, s), and some smaller groups like e and r; the drawing shows a portion of the section indicated in the diagram, including one of the groups of extrafascicular cambium (a), parts of 6 and s, and also the smaller groups (e and ;-); the bundles of the stele are mesarch, with
RMPFN160–. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 278 CERATOZAMIA CERCOCAKPUS long or more, lanceolate : cones produced annually on separate plants; female cones 9-12 in. long, 4-6 in. thick, the scales 2-horned ; male cones narrower, longer, on a hairy stalk, the scales with two small teeth. Mex. Gn. 9, pp. 308, 309.âAn excellent decorative plant, best grown
RMRPXJ7D–. Text-book of botany, morphological and physiological. Botany. 5o6 PHANEROGAMS. one. This smaller cell now again undergoes a transverse division parallel to the first, and this is sometimes followed by a second; a two- or three-celled body is thus formed, attached on one side to the intine, and projecting into the cavity of the larger cell, as in Abietineae, which, moreover, further resembles Ceratozamia in the fact that, as in the Coniferas, the large cell, formed by the first division of the pollen-grain, developes into the pollen-tube, the mass of small cells remaining inactive in the poll
RMPG14YK–. Fossil plants : for students of botany and geology . Paleobotany. 22 CYCADALES [CH. goose's egg: the sterile distal end has the form of a spear-point with an irregularly serrate edge. In C. revoluta, C. pectinata, etc., the sterile part is deeply dissected and may break off (fig. 392, A) from the fertile portion of the sporophyll. The megasporophylls. Fia. 393. A. Stangeria paradoxa, part of microstrobilus. B, D. Encephalartos villosus, megastrobilus in surface-view and in section. ( nat. size.) C. Ceratozamia mexicana, single megasporophyll. of C. Riuminiana exhibit a striking variation in
RMREK85T–. The classification of flowering plants. Plants. 54 FLOWERING PLANTS [CH. In Ceratozamia and Stangeria, according to Treub^° and Lang^ respectively, the spore-mother-cell divides transversely into three cells (potential mega- spores), the lowest of which be- comes the functional megaspore, enlarging rapidly at the expense of the others and adjacent cells. In Cycas the outer wall of the megaspore becomes cutinized. Fig. 6. Female cone of Macrozamia Preissii, I nat. size. The cone has been in part cut lengthwise to shew the attach- ment of the carpels to the axis (a), and the position of the se
RMPG2KBD–. Morphology of gymnosperms. Gymnosperms; Plant morphology. 136 MORPHOLOGY OF GYMNOSPERMS A ventral canal cell in cycads was first described by Strasbukger (7) in 1876 for Cycas sphaerica, and the next year Warming (8) described one in Ceratozamia rohusta, but soon concluded that he had been mistaken. Treub (13) in 1884 failed to find any ventral canal cell in Cycas circinalis, and from that time it was generally believed that the cycads have no ventral canal cell. In 1898, however, Ikeno (27) made an unmistakable demonstration of the critical. Figs. 145-147.âThe ventral nucleus in cycads: fig
![. Morphology of gymnosperms. Gymnosperms; Plant morphology. CYCADALES lOS fusion of its cotyledons. They arise as two distinct organs, but in the older embryos the fusion is so complete that serial sections from the apex down- ward almost to the apex of the plumule do not reveal the characteristic "seam," in many cases the abutting epidermal layers having disappeared. As in Ceratozamia, there is no "resting stage" of the embryo, which emerges from the testa as soon as it is formed. In Ceratozamia, Dioon, Micro- cycas, and Zamia, and pre- sumably in other cycads, the root is Stock Photo](https://c8.alamy.com/comp/RDG96R/morphology-of-gymnosperms-gymnosperms-plant-morphology-cycadales-los-fusion-of-its-cotyledons-they-arise-as-two-distinct-organs-but-in-the-older-embryos-the-fusion-is-so-complete-that-serial-sections-from-the-apex-down-ward-almost-to-the-apex-of-the-plumule-do-not-reveal-the-characteristic-quotseamquot-in-many-cases-the-abutting-epidermal-layers-having-disappeared-as-in-ceratozamia-there-is-no-quotresting-stagequot-of-the-embryo-which-emerges-from-the-testa-as-soon-as-it-is-formed-in-ceratozamia-dioon-micro-cycas-and-zamia-and-pre-sumably-in-other-cycads-the-root-is-RDG96R.jpg ". Morphology of gymnosperms. Gymnosperms; Plant morphology. CYCADALES lOS fusion of its cotyledons. They arise as two distinct organs, but in the older embryos the fusion is so complete that serial sections from the apex down- ward almost to the apex of the plumule do not reveal the characteristic "seam," in many cases the abutting epidermal layers having disappeared. As in Ceratozamia, there is no "resting stage" of the embryo, which emerges from the testa as soon as it is formed. In Ceratozamia, Dioon, Micro- cycas, and Zamia, and pre- sumably in other cycads, the root is Stock Photo")
RMRDG96R–. Morphology of gymnosperms. Gymnosperms; Plant morphology. CYCADALES lOS fusion of its cotyledons. They arise as two distinct organs, but in the older embryos the fusion is so complete that serial sections from the apex down- ward almost to the apex of the plumule do not reveal the characteristic "seam," in many cases the abutting epidermal layers having disappeared. As in Ceratozamia, there is no "resting stage" of the embryo, which emerges from the testa as soon as it is formed. In Ceratozamia, Dioon, Micro- cycas, and Zamia, and pre- sumably in other cycads, the root is
RMPG2KEE–. Morphology of gymnosperms. Gymnosperms; Plant morphology. 124 MORPHOLOGY OF GYMNOSPERMS phylls characteristic of Cycas (figs. 112, 114). In Z>. spinulosum and in Stangeria the sporophylls are still less leaflike, and the strobilus. Fig. 114.-—Megasporophylls of cycads: A, Cycas revoluta; B, Cycas circinalis; C, Cycas Normanbyana; D, Dioon edule; E, Encephalartos Preissii; F, Zamia integ- rijoKa; G, Ceratozamia mexicana.—A, after Sachs; C and F, after Von MulleR; E, after MiQUEL; F, after Richard; B, D, and G, drawn for Engler and Prantl's Nat. Pflanzenj., from which the entire plate is ta
![. Contributions from the Hull Botanical Laboratory. Plants. 1908] DORETY—CERATOZAMIA 213 Other changes occur as the meriphyte ascends the petiole (c, d). Just below the first pair of pinnae the branching is rapid, and at the level where the blade is seen exteriorly to separate from the petiole, there are four strands provided for it (j). In the rachis another approximation takes place (/), and the number of bundles is reduced to two (m). Each enters a pinna and branches continuously (n, 0). The growing point terminating the rachis has no vascular trace in this leaf, in this respect agreeing wi Stock Photo](https://c8.alamy.com/comp/REA3G0/contributions-from-the-hull-botanical-laboratory-plants-1908-doretyceratozamia-213-other-changes-occur-as-the-meriphyte-ascends-the-petiole-c-d-just-below-the-first-pair-of-pinnae-the-branching-is-rapid-and-at-the-level-where-the-blade-is-seen-exteriorly-to-separate-from-the-petiole-there-are-four-strands-provided-for-it-j-in-the-rachis-another-approximation-takes-place-and-the-number-of-bundles-is-reduced-to-two-m-each-enters-a-pinna-and-branches-continuously-n-0-the-growing-point-terminating-the-rachis-has-no-vascular-trace-in-this-leaf-in-this-respect-agreeing-wi-REA3G0.jpg ". Contributions from the Hull Botanical Laboratory. Plants. 1908] DORETY—CERATOZAMIA 213 Other changes occur as the meriphyte ascends the petiole (c, d). Just below the first pair of pinnae the branching is rapid, and at the level where the blade is seen exteriorly to separate from the petiole, there are four strands provided for it (j). In the rachis another approximation takes place (/), and the number of bundles is reduced to two (m). Each enters a pinna and branches continuously (n, 0). The growing point terminating the rachis has no vascular trace in this leaf, in this respect agreeing wi Stock Photo")
RMREA3G0–. Contributions from the Hull Botanical Laboratory. Plants. 1908] DORETY—CERATOZAMIA 213 Other changes occur as the meriphyte ascends the petiole (c, d). Just below the first pair of pinnae the branching is rapid, and at the level where the blade is seen exteriorly to separate from the petiole, there are four strands provided for it (j). In the rachis another approximation takes place (/), and the number of bundles is reduced to two (m). Each enters a pinna and branches continuously (n, 0). The growing point terminating the rachis has no vascular trace in this leaf, in this respect agreeing wi
RMPFDKW8–. Der baum. Trees; Plant physiology. Wur/.olwnclioiiin^on. 173 Schlamme kriecht, sohciueii sie sich vorzugsweise zu entwickeln. Auch den Leguminosen, z. B. der Lupine und den Klee-Arten, sind älinliche Auschwelhingen der Wurzel eigen, welche in der eigenthinnlichsten Weise bei den Uber die Erde hervorwachsenden Wurzeln der Cycadeen. auftreten. Bei Ceratozamia muricata sind es lange, wenig verzweigte Wurzeln, welche Fig. 124. Fig. 125.. reihenweise kurze, sternförmig verzweigte Seitenwurzeln ausschicken; bei Ceratozomia mexicana verzweigen sich diese Seitenwurzeln zu einem trauben- artigen Knäu
RMRE2FE5–. Fundamentals of botany. Botany. SAPKOPHYTISJI AND SYMBIOSIS 333 the epidermis is ruptured, thus affording entrance to another nitrogen-fixer, A zotobacter, and also under favor- able conditions, to a blue-green alga (Nostoc). This is the only known case in which four organisms are associated. Fig. 241.—Root-nodules of Cycas revoluta. n, one of several cross- sectional views, showing the zone of the syinbiont alga, Nostoc. together symbiotically. The alga has never been found in the nodules of Bowenia, Ceratozamia, Macrozamia, nor Zamia (all genera of c}-cads). 309. Grafting.—One of the oldes
RMPG14Y1–. Fossil plants : for students of botany and geology . Paleobotany. 24 CYCADALES [CH. sporophylls of Ceratozamia (fig. 393, C): in Macrozamia (fig. 394) the distal ends are prolonged as tapered processes. The surface of the strobilus of Stangeria is formed by imbricate and rounded. Fig. 395. Zamia floridana. I a, complete plant; a, main trunk; b, branch-scar; c, secondary root; d, primary tap-root. (^ uat. size.) I 6, I c, megastrobilus. ( nat. size.) Id, megasporophyll. (Jnat. size.) I e, pinna. (J nat. size. After Wieland.) ends of sporophyUs (fig. 392, H) not unlike the cone-scales of Pinu
RMRDH6PY–. Morphology of gymnosperms. Gymnosperms; Plant morphology. Figs. 128-131.—Diagrams of course of vascular bundles in sporophyll and ovule: fig. 128, Encephalartos villosus, course of bundles in megasporophyll; o, cf, </', three bundles passing to the ovule; fig. 129, small portion of the upper part of the ovule on a larger scale; fig. 130, Microcycas calocoma, vascular supply of ovule and sporo- phyll; fig. 131, Ceratozamia mexicana, vascular supply of ovule and sporophyll.— After Matte (40). little phloem, and when mesarch the development of centripetal xylem is very slight. The large cent
![. Das Leben der Pflanze. Plants; Plants; Plants; Phytogeography. {2 5)ic garnpalmcn. 3?c[onbcr§ incrfiuürbig finb bic ftet§ etngc]"d)tecf)tigen S3lüten, bcnen S3lumen= blattet üöflig abgcfjen. 2)ic männli(f)cn erinnern ftnrf an bie ^apf^n '^^^ 3^abelbäume unb licitlen nurfi )"o. 2)ic meiblirficn iPIumenbInttcr finb am 6nbe be§ 6tannne§ (fo bei Ceratozamia [fiel^e 23ilbJ) audfj äopfenförmtg, mei[t aber lüeicfje, bid^t brauniüoUige, gefieberte Slätter. 2)ann trogen |ie einige Samenonlogen, bie offen boliegen ober — im gofle äopfenortiger, meiblid^er Slütenftänbe — burd^ ein Sltoffen b Stock Photo](https://c8.alamy.com/comp/PFG96C/das-leben-der-pflanze-plants-plants-plants-phytogeography-2-5ic-garnpalmcn-3c-onbcr-incrfiurbig-finb-bic-ftet-etngc-quotdtecftigen-s3lten-bcnen-s3lumen=-blattet-flig-abgcfjen-2ic-mnnlifcn-erinnern-ftnrf-an-bie-apfn-3abelbume-unb-licitlen-nurfi-quoto-2ic-meiblirficn-ipiumenbinttcr-finb-am-6nbe-be-6tannne-fo-bei-ceratozamia-fiele-23ilbj-audfj-opfenfrmtg-mei-t-aber-leicfje-bidt-brauniouige-gefieberte-sltter-2ann-trogen-ie-einige-samenonlogen-bie-offen-boliegen-ober-im-gofle-opfenortiger-meiblider-sltenftnbe-burd-ein-sltoffen-b-PFG96C.jpg ". Das Leben der Pflanze. Plants; Plants; Plants; Phytogeography. {2 5)ic garnpalmcn. 3?c[onbcr§ incrfiuürbig finb bic ftet§ etngc]"d)tecf)tigen S3lüten, bcnen S3lumen= blattet üöflig abgcfjen. 2)ic männli(f)cn erinnern ftnrf an bie ^apf^n '^^^ 3^abelbäume unb licitlen nurfi )"o. 2)ic meiblirficn iPIumenbInttcr finb am 6nbe be§ 6tannne§ (fo bei Ceratozamia [fiel^e 23ilbJ) audfj äopfenförmtg, mei[t aber lüeicfje, bid^t brauniüoUige, gefieberte Slätter. 2)ann trogen |ie einige Samenonlogen, bie offen boliegen ober — im gofle äopfenortiger, meiblid^er Slütenftänbe — burd^ ein Sltoffen b Stock Photo")
RMPFG96C–. Das Leben der Pflanze. Plants; Plants; Plants; Phytogeography. {2 5)ic garnpalmcn. 3?c[onbcr§ incrfiuürbig finb bic ftet§ etngc]"d)tecf)tigen S3lüten, bcnen S3lumen= blattet üöflig abgcfjen. 2)ic männli(f)cn erinnern ftnrf an bie ^apf^n '^^^ 3^abelbäume unb licitlen nurfi )"o. 2)ic meiblirficn iPIumenbInttcr finb am 6nbe be§ 6tannne§ (fo bei Ceratozamia [fiel^e 23ilbJ) audfj äopfenförmtg, mei[t aber lüeicfje, bid^t brauniüoUige, gefieberte Slätter. 2)ann trogen |ie einige Samenonlogen, bie offen boliegen ober — im gofle äopfenortiger, meiblid^er Slütenftänbe — burd^ ein Sltoffen b
RMRDH6N7–. Morphology of gymnosperms. Gymnosperms; Plant morphology. CYCADALES 147 tube; but in Microcycas Caldwell (52) describes and figures sixteen to twenty sperms (figs. 174, 175), and four sperms are found occa- sionally in Ceratozamia (53). It is evident that in Microcycas the body cell has given rise to eight or ten spermatogenous cells, each of which has produced two sperms. Cupressus Goveniana, described. Figs. 174, 175.—Microcycas calocoma: fig. 174, pollen tube showing nine sperma- togenous cells, in most of which the blepharoplasts are seen; X160; fig. 175, later stage showing sections of
![. Fossil plants : for students of botany and geology . Paleobotany. XXVIII] REPRODFOTIVB SHOOTS 21. Fig. 392. A. Cycas pectinata, apex of megasporophyll. (f nat. size.) B, C. Cycas Riuminiana, megasporophyll. (J nat. size.) D. Eficephalartos AUensteinii. Distal end of megasporophyUs. (rrom the Gardeners' Chronicle.) E, F. Cycas angulata, miorosporophyll and sorus. G, I. Ceratozamia mexicana, I, microsporophyll with soars of sori (s); G, sorus. (After Thibout.) H. Stangeria paradoxa, megastrobilus.. Please note that these images are extracted from scanned page images that may have been digitall Stock Photo](https://c8.alamy.com/comp/RDFE6C/fossil-plants-for-students-of-botany-and-geology-paleobotany-xxviii-reprodfotivb-shoots-21-fig-392-a-cycas-pectinata-apex-of-megasporophyll-f-nat-size-b-c-cycas-riuminiana-megasporophyll-j-nat-size-d-eficephalartos-auensteinii-distal-end-of-megasporophyus-rrom-the-gardeners-chronicle-e-f-cycas-angulata-miorosporophyll-and-sorus-g-i-ceratozamia-mexicana-i-microsporophyll-with-soars-of-sori-s-g-sorus-after-thibout-h-stangeria-paradoxa-megastrobilus-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitall-RDFE6C.jpg ". Fossil plants : for students of botany and geology . Paleobotany. XXVIII] REPRODFOTIVB SHOOTS 21. Fig. 392. A. Cycas pectinata, apex of megasporophyll. (f nat. size.) B, C. Cycas Riuminiana, megasporophyll. (J nat. size.) D. Eficephalartos AUensteinii. Distal end of megasporophyUs. (rrom the Gardeners' Chronicle.) E, F. Cycas angulata, miorosporophyll and sorus. G, I. Ceratozamia mexicana, I, microsporophyll with soars of sori (s); G, sorus. (After Thibout.) H. Stangeria paradoxa, megastrobilus.. Please note that these images are extracted from scanned page images that may have been digitall Stock Photo")
RMRDFE6C–. Fossil plants : for students of botany and geology . Paleobotany. XXVIII] REPRODFOTIVB SHOOTS 21. Fig. 392. A. Cycas pectinata, apex of megasporophyll. (f nat. size.) B, C. Cycas Riuminiana, megasporophyll. (J nat. size.) D. Eficephalartos AUensteinii. Distal end of megasporophyUs. (rrom the Gardeners' Chronicle.) E, F. Cycas angulata, miorosporophyll and sorus. G, I. Ceratozamia mexicana, I, microsporophyll with soars of sori (s); G, sorus. (After Thibout.) H. Stangeria paradoxa, megastrobilus.. Please note that these images are extracted from scanned page images that may have been digitall
RMRD4XD5–. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. CERASTIUM CERATOZAMIA 277 BoissiSrii, Gren. Low: Ivs. silvery, ovate-lanceolate, acute, entire, sessile; peduncles 4-12 in. high : inflores- cence a dichotomous cyme : fls. large, white. Spain.. 410. Cerastium arvense. tomentosum, Linn. Low, creeping, branched: Ivs. ob- long, spatulate, grayish woolly, upper Iv
RMRD57RC–. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches, and a synopsis of the vegetable kingdom. Gardening -- Dictionaries; Plants -- North America encyclopedias. 278 CERATOZAMIA CERCOCARPUS long or more, lanceolate : cones produced annually on separate plants; female cones 9-12 in. long, 4-G in. thick, the scales 2-horned ; male cones narrower, longer, on a hairy stalk, the sc
RMRDCEW2–. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. CEEASTIUM Boissidrii, Gren. Low: Ivs. silvery, ovate-lanceolate, acute, entire, sessile; peduncles 4-12 in. high : inflores- cence a dichotomous cyme : fls. large, white. Spain. CERATOZAMIA 277. 410. Cerastium arvense. tomentdsum, Linn. Low, creeping, branched: Ivs. ob- long, spatulate, grayish woolly, upper Iv
RMRDH6P9–. Morphology of gymnosperms. Gymnosperms; Plant morphology. 136 MORPHOLOGY OF GYMNOSPERMS A ventral canal cell in cycads was first described by Strasbukger (7) in 1876 for Cycas sphaerica, and the next year Warming (8) described one in Ceratozamia rohusta, but soon concluded that he had been mistaken. Treub (13) in 1884 failed to find any ventral canal cell in Cycas circinalis, and from that time it was generally believed that the cycads have no ventral canal cell. In 1898, however, Ikeno (27) made an unmistakable demonstration of the critical. Figs. 145-147.âThe ventral nucleus in cycads: fig
RMRD5AF0–. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 278 CERATOZAMIA CERCOCAKPUS long or more, lanceolate : cones produced annually on separate plants; female cones 9-12 in. long, 4-6 in. thick, the scales 2-horned ; male cones narrower, longer, on a hairy stalk, the scales with two small teeth. Mex. Gn. 9, pp. 308, 309.âAn excellent decorative plant, best grown
RMRDG93M–. Morphology of gymnosperms. Gymnosperms; Plant morphology. Fig. 114.-—Megasporophylls of cycads: A, Cycas revoluta; B, Cycas circinalis; C, Cycas Normanbyana; D, Dioon edule; E, Encephalartos Preissii; F, Zamia integ- rijoKa; G, Ceratozamia mexicana.—A, after Sachs; C and F, after Von MulleR; E, after MiQUEL; F, after Richard; B, D, and G, drawn for Engler and Prantl's Nat. Pflanzenj., from which the entire plate is taken. is much more compact; while in the remaining genera the sporophylls show very little of the leaflike character and are organized into hard compact strobili (fig. 92). In Cy
RMRDFE68–. Fossil plants : for students of botany and geology . Paleobotany. 22 CYCADALES [CH. goose's egg: the sterile distal end has the form of a spear-point with an irregularly serrate edge. In C. revoluta, C. pectinata, etc., the sterile part is deeply dissected and may break off (fig. 392, A) from the fertile portion of the sporophyll. The megasporophylls. Fia. 393. A. Stangeria paradoxa, part of microstrobilus. B, D. Encephalartos villosus, megastrobilus in surface-view and in section. ( nat. size.) C. Ceratozamia mexicana, single megasporophyll. of C. Riuminiana exhibit a striking variation in
RMRDYF28–. A textbook of botany for colleges and universities ... Botany. SPERMATOPHYTES I9S Ovulate. — The ovulate strobili (fig. 442) are sometimes very large. The genus Cycas is peculiar in its ovu- late strobilus, in that it is not a com- pact strobilus, but a rosette of spo- rophylls resembling reduced foliage leaves, in which ovules replace the lower pinnae or teeth (figs. 443,444)- In general, the spo- rophylls vary from the leaflike (pin- nate) forms of Cycas to peltate forms (as in Zamia, fig. 441, and Ceratozamia, fig. 44S). Between these extreme forms there is a complete series of transition
![. Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. 18 MORPHOLOGY OF SPBRMATOPHYTBS Between the base of the beak and the wall of the embryo sac the nucellar tissue is loose, and at the time of the development. Fig. 16.—Ovulate sporophylls of various Cyoads: A, Oycas revoluta; B, Cycas droin- alis; C, Cycas Nbrmanbyana; D, Dioon edwle E, Bncephalartos Preissii; F. Zamia inUgrifolia G, Ceratozamia Mexicana.—A, after Sachs; C, after F. Voir MtJLLEE; £, after Miquel ; F, after Eiohaed ; JS, D, 6, drawn for Englek and Pkantl's Nat. Pflanzenfam., from which the e Stock Photo](https://c8.alamy.com/comp/RE2J15/morphology-of-spermatophytes-part-i-gymnosperms-gymnosperms-plant-morphology-18-morphology-of-spbrmatophytbs-between-the-base-of-the-beak-and-the-wall-of-the-embryo-sac-the-nucellar-tissue-is-loose-and-at-the-time-of-the-development-fig-16ovulate-sporophylls-of-various-cyoads-a-oycas-revoluta-b-cycas-droin-alis-c-cycas-nbrmanbyana-d-dioon-edwle-e-bncephalartos-preissii-f-zamia-inugrifolia-g-ceratozamia-mexicanaa-after-sachs-c-after-f-voir-mtjllee-after-miquel-f-after-eiohaed-js-d-6-drawn-for-englek-and-pkantls-nat-pflanzenfam-from-which-the-e-RE2J15.jpg ". Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. 18 MORPHOLOGY OF SPBRMATOPHYTBS Between the base of the beak and the wall of the embryo sac the nucellar tissue is loose, and at the time of the development. Fig. 16.—Ovulate sporophylls of various Cyoads: A, Oycas revoluta; B, Cycas droin- alis; C, Cycas Nbrmanbyana; D, Dioon edwle E, Bncephalartos Preissii; F. Zamia inUgrifolia G, Ceratozamia Mexicana.—A, after Sachs; C, after F. Voir MtJLLEE; £, after Miquel ; F, after Eiohaed ; JS, D, 6, drawn for Englek and Pkantl's Nat. Pflanzenfam., from which the e Stock Photo")
RMRE2J15–. Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. 18 MORPHOLOGY OF SPBRMATOPHYTBS Between the base of the beak and the wall of the embryo sac the nucellar tissue is loose, and at the time of the development. Fig. 16.—Ovulate sporophylls of various Cyoads: A, Oycas revoluta; B, Cycas droin- alis; C, Cycas Nbrmanbyana; D, Dioon edwle E, Bncephalartos Preissii; F. Zamia inUgrifolia G, Ceratozamia Mexicana.—A, after Sachs; C, after F. Voir MtJLLEE; £, after Miquel ; F, after Eiohaed ; JS, D, 6, drawn for Englek and Pkantl's Nat. Pflanzenfam., from which the e
RMRDCETW–. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 278 CERATOZAMIA CEKCOCABPUS long or more, lanceolate : cones produced annually on separate plants; female cones 9-12 in. long, 4-6 in. thick, the scales 2-horned ; male cones narrower, longer, on a hairy stalk, the scales with two small teeth. Mex. Gn. 9, pp. 308, 309.—An excellent decorative plant, best grown
![. Contributions from the Hull Botanical Laboratory. Plants. 1908] DO RET Y—CERATOZAMIA is sent to the first leaf (fig. 22). As previously noted, this organ, whether scale leaf or foliage leaf, is displaced laterally by the peculiar- ities of its development. All the traces which enter it are likewise distorted, giving rise to a pseudo- girdling condition which is appar- ent in very young seedlings (figs. 22, 27, 31) . The two traces which enter from the groups nearest the leaf (e, e') take first a radial, and then a tangential course to reach a position in the middle of the leaf (figs. 22, 31) Stock Photo](https://c8.alamy.com/comp/REA3G2/contributions-from-the-hull-botanical-laboratory-plants-1908-do-ret-yceratozamia-is-sent-to-the-first-leaf-fig-22-as-previously-noted-this-organ-whether-scale-leaf-or-foliage-leaf-is-displaced-laterally-by-the-peculiar-ities-of-its-development-all-the-traces-which-enter-it-are-likewise-distorted-giving-rise-to-a-pseudo-girdling-condition-which-is-appar-ent-in-very-young-seedlings-figs-22-27-31-the-two-traces-which-enter-from-the-groups-nearest-the-leaf-e-e-take-first-a-radial-and-then-a-tangential-course-to-reach-a-position-in-the-middle-of-the-leaf-figs-22-31-REA3G2.jpg ". Contributions from the Hull Botanical Laboratory. Plants. 1908] DO RET Y—CERATOZAMIA is sent to the first leaf (fig. 22). As previously noted, this organ, whether scale leaf or foliage leaf, is displaced laterally by the peculiar- ities of its development. All the traces which enter it are likewise distorted, giving rise to a pseudo- girdling condition which is appar- ent in very young seedlings (figs. 22, 27, 31) . The two traces which enter from the groups nearest the leaf (e, e') take first a radial, and then a tangential course to reach a position in the middle of the leaf (figs. 22, 31) Stock Photo")
RMREA3G2–. Contributions from the Hull Botanical Laboratory. Plants. 1908] DO RET Y—CERATOZAMIA is sent to the first leaf (fig. 22). As previously noted, this organ, whether scale leaf or foliage leaf, is displaced laterally by the peculiar- ities of its development. All the traces which enter it are likewise distorted, giving rise to a pseudo- girdling condition which is appar- ent in very young seedlings (figs. 22, 27, 31) . The two traces which enter from the groups nearest the leaf (e, e') take first a radial, and then a tangential course to reach a position in the middle of the leaf (figs. 22, 31)
RMRD4XD2–. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 278 CERATOZAMIA CERCOCARPUS long or more, lanceolate : cones produced annually on separate plants; female cones 9-12 in. long, 4-6 in. thick, the scales 2-horned ; male cones narrower, longer, on a hairy stalk, the scales with two small teeth. Mes. Gn. 9, pp. 308, 309.â An excellent decorative plant, best grown
![. The classification of flowering plants. Plants. Ill] CYCADEAE 49 sheath and passes above into a strong rachis on which are borne right and left the sessile, leathery, generally numerous pinnae. The Australian genus Bowenia has bipinnate leaves. Ceratozamia has a pair of tooth-like stipules. The leaves vary much in size and number, from half a foot (Zamia pygmaea) to 9 or 10 feet, and from only a few in Bowenia and Stangeria to more than one hundred in strong plants of Cycas revoluta.. Fig. 4. A. Cycas circinalis. Female plant. (After Blume.) B. Female sporopbyll of Cycas pectinata. C. Albume Stock Photo](https://c8.alamy.com/comp/REK86B/the-classification-of-flowering-plants-plants-ill-cycadeae-49-sheath-and-passes-above-into-a-strong-rachis-on-which-are-borne-right-and-left-the-sessile-leathery-generally-numerous-pinnae-the-australian-genus-bowenia-has-bipinnate-leaves-ceratozamia-has-a-pair-of-tooth-like-stipules-the-leaves-vary-much-in-size-and-number-from-half-a-foot-zamia-pygmaea-to-9-or-10-feet-and-from-only-a-few-in-bowenia-and-stangeria-to-more-than-one-hundred-in-strong-plants-of-cycas-revoluta-fig-4-a-cycas-circinalis-female-plant-after-blume-b-female-sporopbyll-of-cycas-pectinata-c-albume-REK86B.jpg ". The classification of flowering plants. Plants. Ill] CYCADEAE 49 sheath and passes above into a strong rachis on which are borne right and left the sessile, leathery, generally numerous pinnae. The Australian genus Bowenia has bipinnate leaves. Ceratozamia has a pair of tooth-like stipules. The leaves vary much in size and number, from half a foot (Zamia pygmaea) to 9 or 10 feet, and from only a few in Bowenia and Stangeria to more than one hundred in strong plants of Cycas revoluta.. Fig. 4. A. Cycas circinalis. Female plant. (After Blume.) B. Female sporopbyll of Cycas pectinata. C. Albume Stock Photo")
RMREK86B–. The classification of flowering plants. Plants. Ill] CYCADEAE 49 sheath and passes above into a strong rachis on which are borne right and left the sessile, leathery, generally numerous pinnae. The Australian genus Bowenia has bipinnate leaves. Ceratozamia has a pair of tooth-like stipules. The leaves vary much in size and number, from half a foot (Zamia pygmaea) to 9 or 10 feet, and from only a few in Bowenia and Stangeria to more than one hundred in strong plants of Cycas revoluta.. Fig. 4. A. Cycas circinalis. Female plant. (After Blume.) B. Female sporopbyll of Cycas pectinata. C. Albume
RMRDG93R–. Morphology of gymnosperms. Gymnosperms; Plant morphology. 124 MORPHOLOGY OF GYMNOSPERMS phylls characteristic of Cycas (figs. 112, 114). In Z>. spinulosum and in Stangeria the sporophylls are still less leaflike, and the strobilus. Fig. 114.-—Megasporophylls of cycads: A, Cycas revoluta; B, Cycas circinalis; C, Cycas Normanbyana; D, Dioon edule; E, Encephalartos Preissii; F, Zamia integ- rijoKa; G, Ceratozamia mexicana.—A, after Sachs; C and F, after Von MulleR; E, after MiQUEL; F, after Richard; B, D, and G, drawn for Engler and Prantl's Nat. Pflanzenj., from which the entire plate is ta
![. Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. Fig. 16.—Ovulate sporophylls of various Cyoads: A, Oycas revoluta; B, Cycas droin- alis; C, Cycas Nbrmanbyana; D, Dioon edwle E, Bncephalartos Preissii; F. Zamia inUgrifolia G, Ceratozamia Mexicana.—A, after Sachs; C, after F. Voir MtJLLEE; £, after Miquel ; F, after Eiohaed ; JS, D, 6, drawn for Englek and Pkantl's Nat. Pflanzenfam., from which the entire plate is taken. of the pollen tubes this whole region of the nueellus disorgan- izes, leaving more or less of a cavity between the pollen chamber and th Stock Photo](https://c8.alamy.com/comp/RE2J0T/morphology-of-spermatophytes-part-i-gymnosperms-gymnosperms-plant-morphology-fig-16ovulate-sporophylls-of-various-cyoads-a-oycas-revoluta-b-cycas-droin-alis-c-cycas-nbrmanbyana-d-dioon-edwle-e-bncephalartos-preissii-f-zamia-inugrifolia-g-ceratozamia-mexicanaa-after-sachs-c-after-f-voir-mtjllee-after-miquel-f-after-eiohaed-js-d-6-drawn-for-englek-and-pkantls-nat-pflanzenfam-from-which-the-entire-plate-is-taken-of-the-pollen-tubes-this-whole-region-of-the-nueellus-disorgan-izes-leaving-more-or-less-of-a-cavity-between-the-pollen-chamber-and-th-RE2J0T.jpg ". Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. Fig. 16.—Ovulate sporophylls of various Cyoads: A, Oycas revoluta; B, Cycas droin- alis; C, Cycas Nbrmanbyana; D, Dioon edwle E, Bncephalartos Preissii; F. Zamia inUgrifolia G, Ceratozamia Mexicana.—A, after Sachs; C, after F. Voir MtJLLEE; £, after Miquel ; F, after Eiohaed ; JS, D, 6, drawn for Englek and Pkantl's Nat. Pflanzenfam., from which the entire plate is taken. of the pollen tubes this whole region of the nueellus disorgan- izes, leaving more or less of a cavity between the pollen chamber and th Stock Photo")
RMRE2J0T–. Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. Fig. 16.—Ovulate sporophylls of various Cyoads: A, Oycas revoluta; B, Cycas droin- alis; C, Cycas Nbrmanbyana; D, Dioon edwle E, Bncephalartos Preissii; F. Zamia inUgrifolia G, Ceratozamia Mexicana.—A, after Sachs; C, after F. Voir MtJLLEE; £, after Miquel ; F, after Eiohaed ; JS, D, 6, drawn for Englek and Pkantl's Nat. Pflanzenfam., from which the entire plate is taken. of the pollen tubes this whole region of the nueellus disorgan- izes, leaving more or less of a cavity between the pollen chamber and th
RMRH988K–. Botanische Zeitung. Plants; Plants. 29. Jahrgang. M 28, 14. Juli 1871.. Redaction: Hugo von Mohl. — A. de Bary. Inhalt. Orig.: Delpino, Eintheilung d. Pflanzen nach d. dicbogamen Befruchtung und Bemer- kungen über die Befruchtung bei Wasserpflanzen. Mitgetheilt v. Ascherson. — G. Reichen- bach, Notiz über Dendrobium extinctorium. — Litt.: Hinterwaldner, Naturhist. Notizen. — ünterhuber, Lieber d. Frucht von Ceratozamia. — Sonder, Algen des tropischen Australiens. — Ka uffman n, Lieber die Sumbul-Pflanze. D er s., Lieber die inflorescenzder Asperifolien. — Gesellsch.: Schles. f. vaterl. Cultu
RMRDFE5T–. Fossil plants : for students of botany and geology . Paleobotany. 24 CYCADALES [CH. sporophylls of Ceratozamia (fig. 393, C): in Macrozamia (fig. 394) the distal ends are prolonged as tapered processes. The surface of the strobilus of Stangeria is formed by imbricate and rounded. Fig. 395. Zamia floridana. I a, complete plant; a, main trunk; b, branch-scar; c, secondary root; d, primary tap-root. (^ uat. size.) I 6, I c, megastrobilus. ( nat. size.) Id, megasporophyll. (Jnat. size.) I e, pinna. (J nat. size. After Wieland.) ends of sporophyUs (fig. 392, H) not unlike the cone-scales of Pinu
RMRH8GN7–. Botánica descriptiva. Compendio de la flora española. Estudio de las plantas que viven espontáneamente en España y de las más frecuentemente cultivadas que tienen aplicaciones en medicina, agricultura, industria y horticultura. Plants. ABIETACEAS bas familias; son pinnadas y aun bipinnadas, con el pecíolo arrollado en su ápice durante el crecimiento [Zamia, Ceratozamia); pero las divisiones o fo- líolas, que son relativamente anchas, no se arrollan en ningún caso. Flores dioicas en inflorescencias que simulan grandes estróbilos, consti- tuidas por un eje sobre el que se insertan perpendicula
![. Beihefte zum botanischen Centralblatt. Plants. Fig. 6. Ginkgo biloba. Au-dessus de la base d'une feuille. Ox = cellule ä Oxalate de chaiix. Cp tres peu developpe. (Ces premieres tigiires donnent rexplication de toutes les lettres rencontrees dans les suivautes).. C.l.A^. Fig". 7. Ginkgo biloba. Milieu d'une feuille. (certains Zamia et EyicepJtalartos) en passant par les fibres tres typiques des Ceratozamia et les cellules plus ou moins epaisses, avec d'elegants epaississements en reseaux chez Macrozamui. Ginkgo. G. h'doha.^ L. II etait permis d'attendre, en raison de ses autres particul Stock Photo](https://c8.alamy.com/comp/RHY3G5/beihefte-zum-botanischen-centralblatt-plants-fig-6-ginkgo-biloba-au-dessus-de-la-base-dune-feuille-ox-=-cellule-oxalate-de-chaiix-cp-tres-peu-developpe-ces-premieres-tigiires-donnent-rexplication-de-toutes-les-lettres-rencontrees-dans-les-suivautes-cla-figquot-7-ginkgo-biloba-milieu-dune-feuille-certains-zamia-et-eyicepjtalartos-en-passant-par-les-fibres-tres-typiques-des-ceratozamia-et-les-cellules-plus-ou-moins-epaisses-avec-delegants-epaississements-en-reseaux-chez-macrozamui-ginkgo-g-hdoha-l-ii-etait-permis-dattendre-en-raison-de-ses-autres-particul-RHY3G5.jpg ". Beihefte zum botanischen Centralblatt. Plants. Fig. 6. Ginkgo biloba. Au-dessus de la base d'une feuille. Ox = cellule ä Oxalate de chaiix. Cp tres peu developpe. (Ces premieres tigiires donnent rexplication de toutes les lettres rencontrees dans les suivautes).. C.l.A^. Fig". 7. Ginkgo biloba. Milieu d'une feuille. (certains Zamia et EyicepJtalartos) en passant par les fibres tres typiques des Ceratozamia et les cellules plus ou moins epaisses, avec d'elegants epaississements en reseaux chez Macrozamui. Ginkgo. G. h'doha.^ L. II etait permis d'attendre, en raison de ses autres particul Stock Photo")
RMRHY3G5–. Beihefte zum botanischen Centralblatt. Plants. Fig. 6. Ginkgo biloba. Au-dessus de la base d'une feuille. Ox = cellule ä Oxalate de chaiix. Cp tres peu developpe. (Ces premieres tigiires donnent rexplication de toutes les lettres rencontrees dans les suivautes).. C.l.A^. Fig". 7. Ginkgo biloba. Milieu d'une feuille. (certains Zamia et EyicepJtalartos) en passant par les fibres tres typiques des Ceratozamia et les cellules plus ou moins epaisses, avec d'elegants epaississements en reseaux chez Macrozamui. Ginkgo. G. h'doha.^ L. II etait permis d'attendre, en raison de ses autres particul
RMRHY3JC–. Beihefte zum botanischen Centralblatt. Plants. ¥ig. 3. Encephalartos horridus. Sommet d'une foliole. Memes lettres que ci-dessus. On peut voir que les cellules Cp ^ du centripete, c'est-ä-dire celles qiii possedent les reseaux ou les areoles, ne sont pas toujours ä la peri- plierie du falsceau. P. t = parencliyme transversal.. c l..u£. Fig. 4. Ceratozamia inexicana. Sommet d'une foliole. Comme ci-dessus. Cpt ^ se trouve plutot ä la periplierie du Cp et va jusqu' aux fibres de la gaine, Gfi. ceau, des caracteres identiques ä ceux des liydrostereides, et con- stituera une sorte de „gaine de pa
RMRC8F8B–. Embryogenesis in plants. Embryology. EMBRYOGENESIS IN GYMNOSPERMS 183 organising capacity of the distal embryo apex may be discerned. Chamberlain records that the living suspcnsor in Ceratozamia can be pulled out to a length of some 7-8 cm, Polyembryony within a single archegonium has also been observed, e.g. in Macrozamia reidlei, there may be one to three additional lateral embryos. These arise like the main embryo, each owing its formation to a small group of actively dividing cells at the basal periphery of the. Fig. 40. Dioon edule Embryo in longitudinal section, showing an early stage
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