Quick filters:
Page 1 of 2
Mature sporophyte Stock Photos and Images
RM2TAH1E1–Holly Fern, Polystichum lonchitis, growing in limestone scree, with young and mature fronds.
RM2AWWD4H–The structure & development of the mosses and ferns (Archegoniatae) . tyledon is gradually replaced in the laterleaves by the pinnate arrangement, both of the divisions of theleaf and the venation. This is brought about in both cases byan unequal dichotomy, by which one branch develops more 268 MOSSES- AND FERNS CHAP. Strongly than the other, so that the latter appears lateral.With the assumption of the pinnate form the leaf also developsthe wings or appendages upon the axis between the pinnae.In the fully-developed leaves of the mature sporophyte, the lasttrace of this is seen in the ultimate
RMPG0CER–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. X THE HOMOSPOROUS LEPTOSPORANGIATM 359 both sides of the lamina. The development of the stem offers no peculiarities. The apical cell is of the tetrahedral form found in the mature sporophyte. The root is bulky, and the apical cell relatively small, with large segments, dividing less regularly than in Onoclea, and on the whole approaches most nearly to Botrychium. The form of the apical cell is like that of Onoclea or Botrychium, and is interesting because in the later roots this is replaced b
RMW1CPBK–Archive image from page 71 of The developmental anatomy of Isoetes. The developmental anatomy of Isoetes . developmentalana31paol Year: 1963 58 THE DEVELOPMENTAL ANATOMY OF IsoeteS Prthostichies Basal Furrow, or Groove Fig. 14. Sketch of the lower surface of a mature sporophyte in which the Hving roots were limited to one row along each side of the basal furrow. These two rows each form a series of roots. The members of the two series are on alternate orthostichies. Schematic. The abbreviation 'orth.' is used for 'orthos- tichy' in figures 15 to 19. series occupy alternate orthostichies. T
RM2A5T4T1–Ferns in autumn on a surrey woodland floor with fallen leaves and changing foliage, Kent, England, United Kingdom, Europe
![. Elementary biology; an introduction to the science of life . Fig. 153. Alternation of generations in seed-bearing plants 6';«, the male gametophyte, or pollen tube ; m, the male gamete, a nucleus at end of pollen tube ; Gf, the female gametophyte, or embryo sac ; /, the female gamete, a nucleus in the embryo sac; e, the fertilized egg, in embryo sac ; 5]^, young sporophyte, the embryo in the seed ; 6V,, the mature sporophyte, a flower-bearing plant; jj, the large spore, giving rise to the female gametophyte. or the embryo sac. So., the small spores, or pollen grains, giving rise to the male Stock Photo](https://c8.alamy.com/comp/MA76PW/elementary-biology-an-introduction-to-the-science-of-life-fig-153-alternation-of-generations-in-seed-bearing-plants-6-the-male-gametophyte-or-pollen-tube-m-the-male-gamete-a-nucleus-at-end-of-pollen-tube-gf-the-female-gametophyte-or-embryo-sac-the-female-gamete-a-nucleus-in-the-embryo-sac-e-the-fertilized-egg-in-embryo-sac-5-young-sporophyte-the-embryo-in-the-seed-6v-the-mature-sporophyte-a-flower-bearing-plant-jj-the-large-spore-giving-rise-to-the-female-gametophyte-or-the-embryo-sac-so-the-small-spores-or-pollen-grains-giving-rise-to-the-male-MA76PW.jpg ". Elementary biology; an introduction to the science of life . Fig. 153. Alternation of generations in seed-bearing plants 6';«, the male gametophyte, or pollen tube ; m, the male gamete, a nucleus at end of pollen tube ; Gf, the female gametophyte, or embryo sac ; /, the female gamete, a nucleus in the embryo sac; e, the fertilized egg, in embryo sac ; 5]^, young sporophyte, the embryo in the seed ; 6V,, the mature sporophyte, a flower-bearing plant; jj, the large spore, giving rise to the female gametophyte. or the embryo sac. So., the small spores, or pollen grains, giving rise to the male Stock Photo")
RMMA76PW–. Elementary biology; an introduction to the science of life . Fig. 153. Alternation of generations in seed-bearing plants 6';«, the male gametophyte, or pollen tube ; m, the male gamete, a nucleus at end of pollen tube ; Gf, the female gametophyte, or embryo sac ; /, the female gamete, a nucleus in the embryo sac; e, the fertilized egg, in embryo sac ; 5]^, young sporophyte, the embryo in the seed ; 6V,, the mature sporophyte, a flower-bearing plant; jj, the large spore, giving rise to the female gametophyte. or the embryo sac. So., the small spores, or pollen grains, giving rise to the male
RM2TAH16M–Holly Fern, Polystichum lonchitis, growing in limestone scree, with young and mature fronds.
RMTR6DHH–Common Tamarisk-moss (Thuidium tamariscinum, Hypnum tamariscinum, Thuidium tamariscifolium), with capsules, Germany
RM2AFHFC3–. The structure and development of mosses and ferns (Archegoniatae). a. Inthis species, as well as 0. Claytoniana, the sporophylls developfirst and form a group in the centre of a circle of sterile leaves.In O. cinnamomea the sporophylls develop no mesophyll, anddie as soon as the spores are scattered. The Root The roots of the mature sporophyte differ very markedlyfrom those of the other Leptosporangiatse, and have been the THE HOMOSPOROUS LEPTOSPORANGIATJE 363 subject of numerous investigations, but there still is a gooddeal of diversity of opinion as to their exact method of growth.Bower ((
RMPG05MD–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 148 MOSSES AND FERNS CHAP. dermis of the mature sporophyte, which otherwise closely resembles that of Anthoceros. The spores may remain undivided, as in Anthoceros, or in some species, e. g., D. crispus, they become multicellular before they are discharged. In this respect these species of Dendro- ceros recall Conocephalus and Pellia, where germination begins before the spores are set free. Notothylas The third genus, Notothylas, is of especial interest, because it was largely upon the results
RM2A5MY4P–Ferns in autumn on a surrey woodland floor with fallen leaves and changing foliage, Kent, England, United Kingdom, Europe
RMT03T4P–Elementary botany . elementarybotany00atki Year: 1898 GAMETOPHYTE AND SPOROPHYTE. 235 ing from the endosperm into the embryo is stored in the cotyle- dons for use during germination. In other plants the endosperm Fig. 309. Fig. 310. Section of one end of ovule of trillium, showing Embryo e n - young embryo in endosperm. larged. is not all consumed by the time the seed is mature. Examples of this kind are found in the buttercup family, the violet, lily, palm,
RMMA71GW–. Elementary botany . Fig. 279. Macrosporangium ot Cycas revoluta Fig. 280. Roentgen photograph of same, show- ing female prothallium. sporophyte. Archegonia are developed in this internal mass of cells. This aids us in deter- mining that it is the prothal- lium. In cycas it is also called endosperm, just as in the pines. 430. If we cut open one of the mature ovules, we can see the en- dosperm (prothallium) as a whitish mass of tissue. Immediately sur- rounding it at maturity is a thin, papery tissue, the remains of the nucellus (macrosporangium), and outside of this are the coats of the ovule
RM2TAH186–Holly Fern, Polystichum lonchitis, growing in limestone scree, with young and mature fronds.
RM2AXH2C6–Nature and development of plants . at base with spirally arranged leaves, has elongated,lifting the mature sporophyte into the air. The enlargement of the stem,b, is due to the growth of the foot region of the sporophyte; ca, remainsof the ruptured archegonium or calyptra; 0, lid or operculum of the cap-sule.—After Schimper. The stomata and chlorenchyma which were so conspicuous inAnthoceros are less perfectly represented, but the spore mothercells are still developed in a dome-shaped zone. This ratherminute sporophyte at maturity barely breaks through the arche-gonium, known in this condition
RMPG058Y–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 288 MOSSES AND FERNS CHAP. arrangement, both of the divisions of the leaf and the venation. This is brought about in both cases by an unequal dichotomy, by which one branch develops more strongly than the other, so that the lattet appears lateral. With the assumption of the pinnate form the leaf also develops the wings or appendages upon the axis between the pinnae. In the fully-developed leaves of the mature sporophyte, the last trace of this is seen in the ultimate branching of the veins, wh
RM2A5T651–Ferns in autumn on a surrey woodland floor with fallen leaves and changing foliage, Kent, England, United Kingdom, Europe
RMRWTANX–Elementary botany (1898) Elementary botany elementarybotany00atki Year: 1898 GAMETOPHYTE AND SPOROPHYTE. 235 ing from the endosperm into the embryo is stored in the cotyle- dons for use during germination. In other plants the endosperm Fig. 309. Fig. 310. Section of one end of ovule of trillium, showing Embryo e n - young embryo in endosperm. larged. is not all consumed by the time the seed is mature. Examples of this kind are found in the buttercup family, the violet, lily, palm,
RM2TAH182–Holly Fern, Polystichum lonchitis, growing in limestone scree, with young and mature fronds.
RM2AWRHB3–The structure & development of the mosses and ferns (Archegoniatae) . B. in Fig. 200.—Azolla JiUcidoides (Lam.). Nearly median section of the young sporophyte after it hasbroken through the prothallium, x 100 ; B, an older plant with the macrospore {sp) still attached ;7«, massulse attached to the base of the macrospore ; r. the primarj root, X 40. about eight leaves, but whether its position is constant was notdetermined. The Mature Sporophyte Strasburger ^ has investigated very completely the tissuesof the mature sporophyte of Azolla, and Pringsheim - has donethe same in Salvinia, so that th
RMPG0CBP–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 378 MOSSES AND FERNS CHAP. closely with those of the other Leptosporangiatae. The coty- ledon is simple with a single median vein, and a root is present in all species yet examined. The Mature Sporophyte Prantl (i) has given a very complete account of the struc- ture of the mature sporophyte, and Bower (11) has added to this by a careful study of the meristems of the different organs. From the investigations of the latter it seems that here, as in nearly all other Ferns, the stem apex has the
RM2A5MY26–Ferns in autumn on a surrey woodland floor with fallen leaves and changing foliage, Kent, England, United Kingdom, Europe
RMT03JKJ–Elementary botany . elementarybotany00atki Year: 1898 FURTHER STUDIES ON GYMNOSPERMS. 215 developed entirely inside of the macrosporangium, and derives the nutriment for its growth from the cycas plant, which is the Fig. 279. Macrosporangium ot Cycas revoluta Fig. 280. Roentgen photograph of same, show- ing female prothallium. sporophyte. Archegonia are developed in this internal mass of cells. This aids us in deter- mining that it is the prothal- lium. In cycas it is also called endosperm, just as in the pines. 430. If we cut open one of the mature ovules, we can see the en- dosperm (prot
RM2AXH4YP–Nature and development of plants . FlG. 194. Structure of the nearly mature sporophyte: A, continuationof the growth in Fig. 193, C, showing the formation of a foot, f, stalk, andcapsules, c, which contain elongated dark cells, the elaters, and the spores.The archegonium has been ruptured by the elongation of the stalk and isnot shown in the figure, p, perianth. B, enlargement of the base of A,showing the attachment of the foot (indicated by darker lines) to thetissues of the antheridial stalk. C, an elater and spores.. Fig. 195. Archegonial branch with mature sporophytes: A, branch withthe da
RMPG0563–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. B.. -M Fig. 242.—Asolla Uliculoides. A, Mature sporophyte, X2; B, lower surface of a branch with two microsporangial son {sp), X6; C, macrosporangial (mo) and microspo- rangial (mi) sori, Xio,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Campbell, Douglas Houghton, 1859-1953. New York, The Macmillan Company;
RM2A5TH83–Ferns in autumn on a surrey woodland floor with fallen leaves and changing foliage, Kent, England, United Kingdom, Europe
RMRWTA8N–Elementary botany (1898) Elementary botany elementarybotany00atki Year: 1898 GAMETOPHYTE AND SPOROPHYTE. 231 synergids. The egg cell is all that remains of the archegonium in this reduced prothallium. The three nuclei at the lower end are the antipodal cells. Fig. 302. Podophyllum peltatum, ovule containing mature embryo sac ; two synergids and egg at left, endosperm nucleus in center, three antipodal cells at right. 455. Embryo sac is the young female prothallium.—In figures 303, 305 are shown the different stages in the develop- ment of the embryo sac in lilium. The embryo sac at this st
![A morphological study of some members of the genus Pallavicinia . ers have two spiral bands. The one figured, whichmeasured 150^1 in length, was somewhat shorter than the majority ofthem. The mature sporophyte of P. radiculosa differs from that of P.Zollingeri in its shorter seta, which, according to Schiffner [1], is only15-20 mm. in length. The capsule, however, is much longer than in P.Zollingeri, but almost perfectly cylindrical in form, scarcely exceedingin width the seta (Fig. 23, D). As already stated, also, the apex isconspicuously pointed. It opens in the same way, by four narrow valv Stock Photo](https://c8.alamy.com/comp/2AWYATG/a-morphological-study-of-some-members-of-the-genus-pallavicinia-ers-have-two-spiral-bands-the-one-figured-whichmeasured-1501-in-length-was-somewhat-shorter-than-the-majority-ofthem-the-mature-sporophyte-of-p-radiculosa-differs-from-that-of-pzollingeri-in-its-shorter-seta-which-according-to-schiffner-1-is-only15-20-mm-in-length-the-capsule-however-is-much-longer-than-in-pzollingeri-but-almost-perfectly-cylindrical-in-form-scarcely-exceedingin-width-the-seta-fig-23-d-as-already-stated-also-the-apex-isconspicuously-pointed-it-opens-in-the-same-way-by-four-narrow-valv-2AWYATG.jpg "A morphological study of some members of the genus Pallavicinia . ers have two spiral bands. The one figured, whichmeasured 150^1 in length, was somewhat shorter than the majority ofthem. The mature sporophyte of P. radiculosa differs from that of P.Zollingeri in its shorter seta, which, according to Schiffner [1], is only15-20 mm. in length. The capsule, however, is much longer than in P.Zollingeri, but almost perfectly cylindrical in form, scarcely exceedingin width the seta (Fig. 23, D). As already stated, also, the apex isconspicuously pointed. It opens in the same way, by four narrow valv Stock Photo")
RM2AWYATG–A morphological study of some members of the genus Pallavicinia . ers have two spiral bands. The one figured, whichmeasured 150^1 in length, was somewhat shorter than the majority ofthem. The mature sporophyte of P. radiculosa differs from that of P.Zollingeri in its shorter seta, which, according to Schiffner [1], is only15-20 mm. in length. The capsule, however, is much longer than in P.Zollingeri, but almost perfectly cylindrical in form, scarcely exceedingin width the seta (Fig. 23, D). As already stated, also, the apex isconspicuously pointed. It opens in the same way, by four narrow valv
RMPG04EE–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. ISOETACE^ S53 leaves continues up to about the eighth, when the divergence is replaced successively by dition in the fully-developed sporophyte, , I, I, tV and ix, which is the con- The Adult Sporophyte (Sadebeck (p)) The structure of the mature sporophyte has been the sub- ject of repeated investigations, among the most recent being. Fig. 320.—^A, B, Isoetes echinospora. A, Section of fully developed leaf, X15: B, vascular bundle of the leaf, X about 200; C, part of a transverse section of
RM2A5T5HP–Ferns in autumn on a surrey woodland floor with fallen leaves and changing foliage, Kent, England, United Kingdom, Europe
RMT03JKK–Elementary botany . elementarybotany00atki Year: 1898 Fig. 279. Macrosporangium ot Cycas revoluta Fig. 280. Roentgen photograph of same, show- ing female prothallium. sporophyte. Archegonia are developed in this internal mass of cells. This aids us in deter- mining that it is the prothal- lium. In cycas it is also called endosperm, just as in the pines. 430. If we cut open one of the mature ovules, we can see the en- dosperm (prothallium) as a whitish mass of tissue. Immediately sur- rounding it at maturity is a thin, papery tissue, the remains of the nucellus (macrosporangium), and outside o
RM2AFKWNE–. The structure and development of mosses and ferns (Archegoniatae). a. D.. b FiC. yZ.—Dendroceros Breutelii. A, Thallus with sporophyte attached, X4; B, apexof the thallus X600; C, archegonium, X600; D, E, young antheridia, X600. developed than in either species of Anthoceros that were studiedby the writer, showing only an imperfect division into two lay-ers when seen in section. No stomata are developed in the epi- 148 MOSSES AND FERNS CHAE. dermis of the mature sporophyte, which otherwise cidsel}/resemhles thdit oi Anthoceros. : The spores may remain undivided, as in Anthoceros, or insome s
![. The developmental anatomy of Isoetes. Isoetes; Botany. 58 THE DEVELOPMENTAL ANATOMY OF IsoeteS Prthostichies. Basal Furrow, or Groove Fig. 14. Sketch of the lower surface of a mature sporophyte in which the Hving roots were limited to one row along each side of the basal furrow. These two rows each form a series of roots. The members of the two series are on alternate orthostichies. Schematic. The abbreviation "orth." is used for "orthos- tichy" in figures 15 to 19. series occupy alternate orthostichies. This alternation can be seen in plate 16, B, by comparing series S a Stock Photo](https://c8.alamy.com/comp/PFA98W/the-developmental-anatomy-of-isoetes-isoetes-botany-58-the-developmental-anatomy-of-isoetes-prthostichies-basal-furrow-or-groove-fig-14-sketch-of-the-lower-surface-of-a-mature-sporophyte-in-which-the-hving-roots-were-limited-to-one-row-along-each-side-of-the-basal-furrow-these-two-rows-each-form-a-series-of-roots-the-members-of-the-two-series-are-on-alternate-orthostichies-schematic-the-abbreviation-quotorthquot-is-used-for-quotorthos-tichyquot-in-figures-15-to-19-series-occupy-alternate-orthostichies-this-alternation-can-be-seen-in-plate-16-b-by-comparing-series-s-a-PFA98W.jpg ". The developmental anatomy of Isoetes. Isoetes; Botany. 58 THE DEVELOPMENTAL ANATOMY OF IsoeteS Prthostichies. Basal Furrow, or Groove Fig. 14. Sketch of the lower surface of a mature sporophyte in which the Hving roots were limited to one row along each side of the basal furrow. These two rows each form a series of roots. The members of the two series are on alternate orthostichies. Schematic. The abbreviation "orth." is used for "orthos- tichy" in figures 15 to 19. series occupy alternate orthostichies. This alternation can be seen in plate 16, B, by comparing series S a Stock Photo")
RMPFA98W–. The developmental anatomy of Isoetes. Isoetes; Botany. 58 THE DEVELOPMENTAL ANATOMY OF IsoeteS Prthostichies. Basal Furrow, or Groove Fig. 14. Sketch of the lower surface of a mature sporophyte in which the Hving roots were limited to one row along each side of the basal furrow. These two rows each form a series of roots. The members of the two series are on alternate orthostichies. Schematic. The abbreviation "orth." is used for "orthos- tichy" in figures 15 to 19. series occupy alternate orthostichies. This alternation can be seen in plate 16, B, by comparing series S a
RM2A5T5AT–Ferns in autumn on a surrey woodland floor with fallen leaves and changing foliage, Kent, England, United Kingdom, Europe
RM2AWRA9R–The structure & development of the mosses and ferns (Archegoniatae) . B. ;/-Mi ^^. Fig. 205.—AzoUa filiculoidcs (Lam.). A, Mature sporophyte, X2; B, lower surface of a branchwith two microsporangial sori (sp), x6 ; C, macrosporangial (w«) and microsporangial (ini)sori, X 10. become absorbed, as Strasburger ^ states, but remains intact,though very much compressed, until the spore is ripe. ? Strasburger (6), p. 71. 398 MOSSES AND FERNS chap. In the microsporic sorus, the apex of the placenta does notdevelop sporangia, but remains as a sort of columella (Fig. 202, A). The sporocarps of Salvinia a
RMPG49XG–. Botany for agricultural students . Botany. GAMBTOPHYTES 443 the young sporophyte until it becomes self-supporting. The female gametophyte therefore consists of many cells when mature and bears a number of archegonia on the portion exposed by the opening forced in the spore wall by the expansion of the game- tophyte. Previous to fertiUzation, the male gametophytes, each still, except for a small slit-Hke opening, encased in the wall of the. Fig. 395. — The gametophytes and young sporophyte of Selaginella. A, a megaspore containing a female gametophyte with the portion bearing the archegonia e
RM2A6238D–Ferns in autumn on a surrey woodland floor with fallen leaves and changing foliage, Kent, England, United Kingdom, Europe
RM2AWP8Y9–The structure & development of the mosses and ferns (Archegoniatae) . ical cell is apparently present, butin others the presence of such a cell was doubtful, and in L.cernmivi in no case did he find any evidence of a single initial.The vegetative cone of the mature sporophyte is usuallybroad (Fig. 246) and only slightly convex. Its centre isoccupied by a group of similar initial cells, which in L. selago, Treub (2), vol. v. 2 Treub, I.e. PI. XXIX. XIV L YCOPODINE^E 471 according to Strasburgcr,^ usually show two initials in longi-tudinal section (Fig. 247, i). From these initials arc cut offla
RMPG43E9–. Plant genetics . Heredity; Mendel's law; Plant breeding. Angiospenn Egg Fusion Nucleus Old Megaspore Wall, Inclosing Female Gametophyte OVULE. Gymnospenn Angiospenn SEED Fig. 34.—Diagrams contrasting young ovules and mature seeds of gymnosperms and angiosperms. gametophyte tissue; fertiUzation affects the egg only, resulting in a sporophyte embryo. In the seed, there- fore, the embryo is imbedded in nutritive tissue which is. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustra
RM2A5MXTF–Ferns in autumn on a surrey woodland floor with fallen leaves and changing foliage, Kent, England, United Kingdom, Europe
RMRDFBW6–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. X THE HOMOSPOROUS LEPTOSPORANGIATM 359 both sides of the lamina. The development of the stem offers no peculiarities. The apical cell is of the tetrahedral form found in the mature sporophyte. The root is bulky, and the apical cell relatively small, with large segments, dividing less regularly than in Onoclea, and on the whole approaches most nearly to Botrychium. The form of the apical cell is like that of Onoclea or Botrychium, and is interesting because in the later roots this is replaced b
RMPG3TWG–. Botany for agricultural students . Botany. PINES (PINACEAE) 451 maining portion of the nucellus hardens, so that the seed when mature resembles some of the stone fruits, such as the Plum, although it is a seed and not a fruit. It is obvious that a seed is simply a transformed megaspo- rangium. In the Cycads a seed is a megasporangium which has its outer portions modified for protection and contains within a female gametophyte bearing a . young sporophyte. Thus the re- duction of the female gametophyte through the Pteridophytes and finally its retention in the mega- sporangium in the Cycads s
RM2A5MXXD–Ferns in autumn on a surrey woodland floor with fallen leaves and changing foliage, Kent, England, United Kingdom, Europe
RMRDFC99–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 288 MOSSES AND FERNS CHAP. arrangement, both of the divisions of the leaf and the venation. This is brought about in both cases by an unequal dichotomy, by which one branch develops more strongly than the other, so that the lattet appears lateral. With the assumption of the pinnate form the leaf also develops the wings or appendages upon the axis between the pinnae. In the fully-developed leaves of the mature sporophyte, the last trace of this is seen in the ultimate branching of the veins, wh
RMPG2RDM–. Heredity and evolution in plants. Heredity; Plants. 126 HEREDITY AND EVOLUTION IN PLANTS 101. Evidence from Comparative Ontogeny.—In zool- ogy, evidence of the course of evolution is also seen in the recapitulation of the characters of lower forms in the em- bryogeny of higher forms. This is often referred to as von Baer's law. Evidence of that nature is less striking and less common in plants. It is found, however, in a com- parison of the young or embryonic stage of the sporophyte of the higher liverwort, Marchantia, with the mature. Fig. 64.—The apical cell in the stem apex in various phy
RM2A5T45R–Ferns in autumn on a surrey woodland floor with fallen leaves and changing foliage, Kent, England, United Kingdom, Europe
RMRDF356–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 148 MOSSES AND FERNS CHAP. dermis of the mature sporophyte, which otherwise closely resembles that of Anthoceros. The spores may remain undivided, as in Anthoceros, or in some species, e. g., D. crispus, they become multicellular before they are discharged. In this respect these species of Dendro- ceros recall Conocephalus and Pellia, where germination begins before the spores are set free. Notothylas The third genus, Notothylas, is of especial interest, because it was largely upon the results
![. Mosses with a hand-lens; a non-technical handbook of the more common and more easily recognized mosses of the north-eastern United States. Mosses. 96 MOSSKS WITH A HAND-l.l',NS. FiGURiS 40. Philonotis fontana X I; leaf, capsule, and male head X 10. dom appearing in sterile mats. Although Philonotis is common, the sporophyte is infrequent. The capsules mature in May or June. Family 17. Bryaceae. The Bryom Family. HE capsules of the Bryum Family are nearly always drooping and frequently have a well marked neck when dry. The peristome is double and well developed. (See glossary under "Peri Stock Photo](https://c8.alamy.com/comp/PG3W6B/mosses-with-a-hand-lens-a-non-technical-handbook-of-the-more-common-and-more-easily-recognized-mosses-of-the-north-eastern-united-states-mosses-96-mossks-with-a-hand-llns-figuris-40-philonotis-fontana-x-i-leaf-capsule-and-male-head-x-10-dom-appearing-in-sterile-mats-although-philonotis-is-common-the-sporophyte-is-infrequent-the-capsules-mature-in-may-or-june-family-17-bryaceae-the-bryom-family-he-capsules-of-the-bryum-family-are-nearly-always-drooping-and-frequently-have-a-well-marked-neck-when-dry-the-peristome-is-double-and-well-developed-see-glossary-under-quotperi-PG3W6B.jpg ". Mosses with a hand-lens; a non-technical handbook of the more common and more easily recognized mosses of the north-eastern United States. Mosses. 96 MOSSKS WITH A HAND-l.l',NS. FiGURiS 40. Philonotis fontana X I; leaf, capsule, and male head X 10. dom appearing in sterile mats. Although Philonotis is common, the sporophyte is infrequent. The capsules mature in May or June. Family 17. Bryaceae. The Bryom Family. HE capsules of the Bryum Family are nearly always drooping and frequently have a well marked neck when dry. The peristome is double and well developed. (See glossary under "Peri Stock Photo")
RMPG3W6B–. Mosses with a hand-lens; a non-technical handbook of the more common and more easily recognized mosses of the north-eastern United States. Mosses. 96 MOSSKS WITH A HAND-l.l',NS. FiGURiS 40. Philonotis fontana X I; leaf, capsule, and male head X 10. dom appearing in sterile mats. Although Philonotis is common, the sporophyte is infrequent. The capsules mature in May or June. Family 17. Bryaceae. The Bryom Family. HE capsules of the Bryum Family are nearly always drooping and frequently have a well marked neck when dry. The peristome is double and well developed. (See glossary under "Peri
RM2A5MXY8–Ferns in autumn on a surrey woodland floor with fallen leaves and changing foliage, Kent, England, United Kingdom, Europe
RMRDFBME–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 378 MOSSES AND FERNS CHAP. closely with those of the other Leptosporangiatae. The coty- ledon is simple with a single median vein, and a root is present in all species yet examined. The Mature Sporophyte Prantl (i) has given a very complete account of the struc- ture of the mature sporophyte, and Bower (11) has added to this by a careful study of the meristems of the different organs. From the investigations of the latter it seems that here, as in nearly all other Ferns, the stem apex has the
RMPG3CK9–. Plant studies; an elementary botany. Botany. 312 I'LANT STUniES cells more or less modified for conduction. Above these the dorsal region is organized into a series of large air cham- bers, into which project chlorophyll-containing cells in the. Fig. 2,S6. Marchantla pnlyiiinrlilia, a rommon liviTwnrt : 7, Ihalhis, witli rhizoids, bearing a mature arclirf;ciiiial liraiidi ( r'l and KrviTal yniiiiKcr ours («, b, c, ./, f l; 2aiid3, dorsal and vmtral views nf arclic>£;niual (iisli; 7, and ,>;, young sporophyte (spnrogonium) embryos; i;, more nialiire sporei^'oninni still within enlarged
RM2A5T52R–Ferns in autumn on a surrey woodland floor with fallen leaves and changing foliage, Kent, England, United Kingdom, Europe
RMRE1PT3–. Nature and development of plants. Botany. Fig. 194. Structure of the nearly mature sporophyte: A, continuation of the growth in Fig. 193, C, showing the formation of a foot, /, stalk, and capsules, c, which contain elongated dark cells, the elaters, and the spores. The archegonium has been ruptured by the elongation of the stalk and is not shown in the figure, p, perianth. 5, enlargement of the base of At showing the attachment of .the foot (indicated by darker lines) to the tissues of the antheridial stalk. C, an elater and spores.. Fig. 195. Archegonial branch with mature sporophytes: A, b
![. Mosses with a hand-lens; a non-technical handbook of the more common and more easily recognized mosses of the north-eastern United States. Mosses. f ^-^N d" Figure 29. a, a, Ulota crispa X 4 and X i respectively, b, b', Cap^ sules of the same X 20. c, Young sporophyte with calyptra X 20. d. d', U. Ludwigii X 4 and X I respectively, c, Capsule X 20. f, Calyptra of mature capsule X 21. twisted when dry. These two species grow exclusively on trees. U. Americana (Beauv.) Lindb., the American Ulota, grows exclusively on rocks. Its leaves are rigid when dry like those of Orthotrichum, not cri Stock Photo](https://c8.alamy.com/comp/PG3W8W/mosses-with-a-hand-lens-a-non-technical-handbook-of-the-more-common-and-more-easily-recognized-mosses-of-the-north-eastern-united-states-mosses-f-n-dquot-figure-29-a-a-ulota-crispa-x-4-and-x-i-respectively-b-b-cap-sules-of-the-same-x-20-c-young-sporophyte-with-calyptra-x-20-d-d-u-ludwigii-x-4-and-x-i-respectively-c-capsule-x-20-f-calyptra-of-mature-capsule-x-21-twisted-when-dry-these-two-species-grow-exclusively-on-trees-u-americana-beauv-lindb-the-american-ulota-grows-exclusively-on-rocks-its-leaves-are-rigid-when-dry-like-those-of-orthotrichum-not-cri-PG3W8W.jpg ". Mosses with a hand-lens; a non-technical handbook of the more common and more easily recognized mosses of the north-eastern United States. Mosses. f ^-^N d" Figure 29. a, a, Ulota crispa X 4 and X i respectively, b, b', Cap^ sules of the same X 20. c, Young sporophyte with calyptra X 20. d. d', U. Ludwigii X 4 and X I respectively, c, Capsule X 20. f, Calyptra of mature capsule X 21. twisted when dry. These two species grow exclusively on trees. U. Americana (Beauv.) Lindb., the American Ulota, grows exclusively on rocks. Its leaves are rigid when dry like those of Orthotrichum, not cri Stock Photo")
RMPG3W8W–. Mosses with a hand-lens; a non-technical handbook of the more common and more easily recognized mosses of the north-eastern United States. Mosses. f ^-^N d" Figure 29. a, a, Ulota crispa X 4 and X i respectively, b, b', Cap^ sules of the same X 20. c, Young sporophyte with calyptra X 20. d. d', U. Ludwigii X 4 and X I respectively, c, Capsule X 20. f, Calyptra of mature capsule X 21. twisted when dry. These two species grow exclusively on trees. U. Americana (Beauv.) Lindb., the American Ulota, grows exclusively on rocks. Its leaves are rigid when dry like those of Orthotrichum, not cri
RM2A62310–Ferns in autumn on a surrey woodland floor with fallen leaves and changing foliage, Kent, England, United Kingdom, Europe
RMRDYFRG–. A textbook of botany for colleges and universities ... Botany. lOO MORPHOLOGY. produce spores, is said to be sterile. This sterile tissue in Marchantia, which was sporogenous tissue in the Ricciaceae, forms a region of the sporophyte quite distinct from the spore-producing region, so that in the mature sporophyte three regions are recognized: (i) the capsule, containing the spores; (2) the seta, a short stalk beneath the capsule, which elongates rapidly as the capsule matures; and (3) the foot, a spreading structure in which the seta ends, and which anchors the sporophyte in the gametophyte
RM2A5T56T–Ferns in autumn on a surrey woodland floor with fallen leaves and changing foliage, Kent, England, United Kingdom, Europe
RMRDF2CH–. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. B.. -M Fig. 242.—Asolla Uliculoides. A, Mature sporophyte, X2; B, lower surface of a branch with two microsporangial son {sp), X6; C, macrosporangial (mo) and microspo- rangial (mi) sori, Xio,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Campbell, Douglas Houghton, 1859-1953. New York, The Macmillan Company;
RM2A5T5TG–Ferns in autumn on a surrey woodland floor with fallen leaves and changing foliage, Kent, England, United Kingdom, Europe
RMRE1PT6–. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 287 while others, known as elaters, elongate greatly and serve to con- duct the foods absorbed by the foot to the spore mother cells, and finally they become spirally thickened (Fig. 194, C). These elaters arise through the sterilization of certain of the spore- '^'L^v- ^ pX<f- Aft. Fig. 194. Structure of the nearly mature sporophyte: A, continuation of the growth in Fig. 193, C, showing the formation of a foot, /, stalk, and capsules, c, which contain elongated dark cells, the elaters, and the spores. The archegonium has bee
RM2A622ET–Ferns in autumn on a surrey woodland floor with fallen leaves and changing foliage, Kent, England, United Kingdom, Europe
RMRDXGC8–. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. GENERAL MORPHOLOGY 297 + iS. [• IG. 145- A = the sporophylls no longer serve as assimilating leaves, but appear as chaffy scales, performing a protective function. It would be difficult to read from the comparative study of the mature sporophyte in the genus Lycopodium any other evolutionary story than this. The only other living genus of eligulate Lycopods is the monotypic Phylloglossum, long recognised as the simplest of them all. The mature plant as seen above ground consists of a tuft of almost cy
Search Results for Mature sporophyte Stock Photos and Images (177)
Page 1 of 2