. Morphology of gymnosperms. Gymnosperms; Plant morphology. 245 246 Figs. 242-246.—Ginkgo biloba: archegonium and embryogeny; fig. 242, longi- tudinal section of the neck of the. archegonium, showing the two cells; X160; fig. 243, transverse section of the same; X160; fig. 244, archegonium shortly before fertilization, showing ventral canal cell (v) and egg nucleus (»); X66; fig. 245, free nuclear stage of the proembryo; X66; fig. 246, later stage, showing that the tissue of the proembryo has resulted from a segmentation of the entire egg; X66.—After Strasburger (4). small-celled meristem whic
. Morphology of gymnosperms. Gymnosperms; Plant morphology. 245 246 Figs. 242-246.—Ginkgo biloba: archegonium and embryogeny; fig. 242, longi- tudinal section of the neck of the. archegonium, showing the two cells; X160; fig. 243, transverse section of the same; X160; fig. 244, archegonium shortly before fertilization, showing ventral canal cell (v) and egg nucleus (»); X66; fig. 245, free nuclear stage of the proembryo; X66; fig. 246, later stage, showing that the tissue of the proembryo has resulted from a segmentation of the entire egg; X66.—After Strasburger (4). small-celled meristem which grows vigorously (fig. 247). This growing region invades the endosperm as a broad, blunt cylinder, the micropylar end of the proembryo being forced back through the. 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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