. Morphology of gymnosperms. Gymnosperms; Plant morphology. 258 MORPHOLOGY OF GYMNOSPERMS tetrad is not always linear, Coeer having reported (85, 86) that in Thuja, so far as he has observed, it is always tetrahedral. In case there are several mother cells, they may all form tetrads. In Sequoia sempervirens (92) the five or six mother cells form tetrads, and ten or twelve megaspores begin to germinate, only two or three continuing beyond the first division, and finally one becoming dominant (figs. 282, 283). The sterile megaspores in this species are quite prominent,. Please note that these im
. Morphology of gymnosperms. Gymnosperms; Plant morphology. 258 MORPHOLOGY OF GYMNOSPERMS tetrad is not always linear, Coeer having reported (85, 86) that in Thuja, so far as he has observed, it is always tetrahedral. In case there are several mother cells, they may all form tetrads. In Sequoia sempervirens (92) the five or six mother cells form tetrads, and ten or twelve megaspores begin to germinate, only two or three continuing beyond the first division, and finally one becoming dominant (figs. 282, 283). The sterile megaspores in this species are quite prominent,. 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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