. Morphology of gymnosperms. Gymnosperms; Plant morphology. 368 Figs. 358-360.—Thuja occidentalis: proembryo and early embryo; fig. 358, mitoses giving rise to eight nuclei; the first walls appear in connection with this mitosis; V, ventral canal nucleus; fig. 359, later stage, after the organization of tiers; fig. 360, continued elongation of the suspensor; X42S.—^After Land (72). a loose group of cells, which Lawson (175) says become about six- teen in number. The terminal cells of this group form the embryo, those just above form a secondary suspensor, and there are still some loose cells b
. Morphology of gymnosperms. Gymnosperms; Plant morphology. 368 Figs. 358-360.—Thuja occidentalis: proembryo and early embryo; fig. 358, mitoses giving rise to eight nuclei; the first walls appear in connection with this mitosis; V, ventral canal nucleus; fig. 359, later stage, after the organization of tiers; fig. 360, continued elongation of the suspensor; X42S.—^After Land (72). a loose group of cells, which Lawson (175) says become about six- teen in number. The terminal cells of this group form the embryo, those just above form a secondary suspensor, and there are still some loose cells between the two suspensor regions (fig. 357). Among the Cupressineae the proembryos of Thuja (72) (figs. 358-360), Juniperus (95, 132) (figs. 361-363), and Lihocedrus (131) have been investigated. In all of them wall-formation occurs. 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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