. Morphology of gymnosperms. Gymnosperms; Plant morphology. Figs. 160-165.—Cycas revoluta: fig. 160, pollen grains at shedding stage; Xsoo, fig. 161, later stage, showing prothallial cell {p) and generative cell [g), the tube nucleus not shown; X200; fig. 162, generative cell divided, giving rise to stalk and body cells; Xsoo; fig. 163, the stalk nucleus {s) being crowded out, and blepharoplasts appearing in the body cell (6); X500; fig. 164, the body cell shortly before division, showing two well-developed blepharoplasts; X 750; fig. 165, the two male cells resulting from the division of the
. Morphology of gymnosperms. Gymnosperms; Plant morphology. Figs. 160-165.—Cycas revoluta: fig. 160, pollen grains at shedding stage; Xsoo, fig. 161, later stage, showing prothallial cell {p) and generative cell [g), the tube nucleus not shown; X200; fig. 162, generative cell divided, giving rise to stalk and body cells; Xsoo; fig. 163, the stalk nucleus {s) being crowded out, and blepharoplasts appearing in the body cell (6); X500; fig. 164, the body cell shortly before division, showing two well-developed blepharoplasts; X 750; fig. 165, the two male cells resulting from the division of the body cell; the beaks of the nuclei are attached to the cilia-bearing bands; X200.—After Ikeno (27). attached and spread along them (fig. 159); later they become smooth and even. During the earlier stages in the development of the body cell, when it is more or less elongated in the direction of the long axis of the pollen tube, the blepharoplasts lie in the plane of the long axis; but as the pollen tube enlarges, the body cell gradually becomes nearly. 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; Coulter, John Merle, 1851-1928. Morphology of spermatophytes. Part I. Gymnosperms. Chicago, University of Chicago Press
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