. Morphology of gymnosperms. Gymnosperms; Plant morphology. 361 Figs. 361-363.—Juniperus communis: proembryo and early embryo; fig. 361, suspensor beginning to elongate; X430; fig. 362, about the same stage; the large nucleus at the top is "presumably the ventral canal nucleus"; X40S; fig. 363, con- tinued elongation of suspensor; X230.—After Noren. soon disintegrate in Thuja. The four cells of the embryo tier in Thuja are not in one plane, having a tetrahedral arrangement. In Widdringtonia and Callitris (159, 176) the details of proembryo- formation have not been observed, but the c
. Morphology of gymnosperms. Gymnosperms; Plant morphology. 361 Figs. 361-363.—Juniperus communis: proembryo and early embryo; fig. 361, suspensor beginning to elongate; X430; fig. 362, about the same stage; the large nucleus at the top is "presumably the ventral canal nucleus"; X40S; fig. 363, con- tinued elongation of suspensor; X230.—After Noren. soon disintegrate in Thuja. The four cells of the embryo tier in Thuja are not in one plane, having a tetrahedral arrangement. In Widdringtonia and Callitris (159, 176) the details of proembryo- formation have not been observed, but the completed proembryo completely fills the egg with a tissue of eight or more cells, resembling in general the proembryo of Sequoia. Saxton states (176), further- more, that walls appear in the proembryo of Widdringtonia before the eight-nucleate stage, which probably means that they appear during. 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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