. Morphology of gymnosperms. Gymnosperms; Plant morphology. GNETALES 397 The embryo cell divides transversely, and this is followed by a succession of divisions in various planes until an ovoid mass of cells. Figs. 448-453.—Ephedra trifurca: development of embryo; fig. 448, one of the proembryos before the formation of the suspensor tube; X500; fig. 449, proembryo with two free nuclei {s, of suspensor; e, of embryo) and a suspensor tube {t); Xsoo; fig. 450, a later stage, showing suspensor (s) and embryo (c); Xsooj fig- 451, character of the wall, nearly complete, which separates the suspensor
. Morphology of gymnosperms. Gymnosperms; Plant morphology. GNETALES 397 The embryo cell divides transversely, and this is followed by a succession of divisions in various planes until an ovoid mass of cells. Figs. 448-453.—Ephedra trifurca: development of embryo; fig. 448, one of the proembryos before the formation of the suspensor tube; X500; fig. 449, proembryo with two free nuclei {s, of suspensor; e, of embryo) and a suspensor tube {t); Xsoo; fig. 450, a later stage, showing suspensor (s) and embryo (c); Xsooj fig- 451, character of the wall, nearly complete, which separates the suspensor and embryo; X 1,900; fig. 452, division of embryo initial cell; s, suspensor; Xsoo; fig. 453, later stage of embryo and secondary suspensor; Land (23). is produced (figs. 452, 453). The basal ceUs of this group elongate successively, forming a multicellular secondary suspensor, which. 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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