. A textbook of botany for colleges and universities ... Botany. Figs. 443, 444. — Mcgasporophylls of Cycas: 443, C. rcvoluta; 4^ \, C. circinalis. may be distinguished in the completed gametophyte; a region of smaller cells at the micropylar end of the embryo sac, in which archegonia are developed; and a deeper region of larger cells, which are nutritive in function (compare Sela- ginella, p. 136). Archegonia. — The archegonia vary widely in number, but three to five are most common. The archegonium initial is a superficial cell, which divides periclinally into a primary neck cell (the outer
. A textbook of botany for colleges and universities ... Botany. Figs. 443, 444. — Mcgasporophylls of Cycas: 443, C. rcvoluta; 4^ \, C. circinalis. may be distinguished in the completed gametophyte; a region of smaller cells at the micropylar end of the embryo sac, in which archegonia are developed; and a deeper region of larger cells, which are nutritive in function (compare Sela- ginella, p. 136). Archegonia. — The archegonia vary widely in number, but three to five are most common. The archegonium initial is a superficial cell, which divides periclinally into a primary neck cell (the outer one) and a central cell (the inner one). Fig. 445. — Mcgasporophylls of C<Ttttoziim;(. 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 Coulter, John Merle, 1851-1928; Barnes, Charles Reid, 1858-1910, joint author; Cowles, Henry Chandler, 1869- joint author. New York, Cincinnati [etc] American book company
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