. Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. CTCADALES 21 Cycas circinalis Treub ^^ once or twice saw a transverse division of one of the neck cells. The central cell is the only remnant of the " axial row " of the lower Archegoniates, true neck canal cells having been eliminated from the history of the archegonium. The great. Fio. 20.—Ci/cas revoluta, development of archegonium: A, upper part of endosperm, showing au archegonium initial (a); B, young archegonium, showing neck cell and central cell; 0, a portion of the layer of jacket cells su
. Morphology of spermatophytes. [Part I. Gymnosperms]. Gymnosperms; Plant morphology. CTCADALES 21 Cycas circinalis Treub ^^ once or twice saw a transverse division of one of the neck cells. The central cell is the only remnant of the " axial row " of the lower Archegoniates, true neck canal cells having been eliminated from the history of the archegonium. The great. Fio. 20.—Ci/cas revoluta, development of archegonium: A, upper part of endosperm, showing au archegonium initial (a); B, young archegonium, showing neck cell and central cell; 0, a portion of the layer of jacket cells surrounding the central cell, showing the cytoplasmic connections; Z>, two cells of the jacket layer, showing the passage of nuclear material into the central cell; -S",-F, (?, successive stages in the mitosis concerned in cutting off the ventral canal cell: A-C, x 200; D-G, x about 500.—After Ikeno. enlargement of the central cell and of its nucleus, during the three months of organization, received special attention from Ikeno, who explains the source of the large supply of nutritive material needed. About the central cell the adjacent endo- sperm cells are organized into a definite jacketlike layer (I' 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; Chamberlain, Charles Joseph, b. 1863. New York, D. Appleton
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