. Botany for high schools. Botany. Fig. 318. Mature and open archegonium of fern (Adiantum cuneatum) with sperms making their way down through the sUme to the egg. (sporophyte), which is the fern plant as we know it. The egg divides by successive divisions, first into two cells and then into four. These four cells, or quad- rants of the embryo, give rise to four parts of the embryo. The anterior upper quadrant gives rise to the stem, the anterior lower one to the leaf, the posterior lower one to the root, and the posterior upper one to a haustorium-like organ called the foot, through which foo

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. Botany for high schools. Botany. Fig. 318. Mature and open archegonium of fern (Adiantum cuneatum) with sperms making their way down through the sUme to the egg. (sporophyte), which is the fern plant as we know it. The egg divides by successive divisions, first into two cells and then into four. These four cells, or quad- rants of the embryo, give rise to four parts of the embryo. The anterior upper quadrant gives rise to the stem, the anterior lower one to the leaf, the posterior lower one to the root, and the posterior upper one to a haustorium-like organ called the foot, through which food substances are passed from the pro- thallium to the embryo until the. latter has established itself on the Two-celled emLo o'fPteris sermlata. ground. The egg case grows for a Remnant of archegonmm neck below. time with the embryo, encloses and protects it. It becomes, therefore, a hood (calyptrd). The root grows quite rapidly, breaks through the hood, and enters the ground. The leaf. 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.. Atkinson, George Francis, 1854-1918. New York, H. Holt and Company