. Morphology of gymnosperms. Gymnosperms; Plant morphology. 338 339 Figs. 338-340.—Fertilization in Juniperus communis: fig. 338, chromatin of sperm and egg nuclei in late prophase within the limits of the egg nucleus; fig. 339, later stage in which the egg and sperm chromosomes are no longer distinguishable; fig. 340, first division of fertilized egg; XS20.—After Noren (132). of male and female chromatin continues into succeeding cell genera- tions or not is a most important question. In his investigation of Sequoia sempervirens, however, Lawson (92) concluded that in fusion the two chromatic
. Morphology of gymnosperms. Gymnosperms; Plant morphology. 338 339 Figs. 338-340.—Fertilization in Juniperus communis: fig. 338, chromatin of sperm and egg nuclei in late prophase within the limits of the egg nucleus; fig. 339, later stage in which the egg and sperm chromosomes are no longer distinguishable; fig. 340, first division of fertilized egg; XS20.—After Noren (132). of male and female chromatin continues into succeeding cell genera- tions or not is a most important question. In his investigation of Sequoia sempervirens, however, Lawson (92) concluded that in fusion the two chromatic masses form a common network, in which the male and female constituents become indistinguishable. 4. The embryo The development of the embryo, as in the preceding groups, includes two general stages: (i) the development of the proembryo, which is the preliminary tissue developed in the base of the egg; and (2) the growth of the suspensor into the endosperm and the develop- ment of the embryo proper at its tip. Among Pinaceae the proembryo is a much less extensive tissue than among Cycadales and Ginkgoales, being a few cells at the base of the egg, the bulk of the egg functioning. 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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