. Morphology of gymnosperms. Gymnosperms; Plant morphology. 212 MORPHOLOGY OF GYMNOSPERMS neck of the archegonium, many of its cells being crushed. In the axis of the advancing cylinder two growing points are soon established, that of the stem at the end of the axis, and that of the root very close. Fig. 247.—Ginkgo biloba: late stage of proembryo; the stem and root will be organized from the small-celled tissue at the apex; X160.—After Lyon (39). to it, the two being separated by very few cells. Later the primordia of the two cotyledons appear in the peripheral region of the cylinder, beginni
. Morphology of gymnosperms. Gymnosperms; Plant morphology. 212 MORPHOLOGY OF GYMNOSPERMS neck of the archegonium, many of its cells being crushed. In the axis of the advancing cylinder two growing points are soon established, that of the stem at the end of the axis, and that of the root very close. Fig. 247.—Ginkgo biloba: late stage of proembryo; the stem and root will be organized from the small-celled tissue at the apex; X160.—After Lyon (39). to it, the two being separated by very few cells. Later the primordia of the two cotyledons appear in the peripheral region of the cylinder, beginning as crescentic mounds of tissue. From an examination of mature seeds, Lyon (39) claims that the proembryo sometimes gives rise to two 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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