. Morphology of gymnosperms. Gymnosperms; Plant morphology. Fig. 445.—Ephedra: A, young ovule; B, of female gametophyte after fertilization, showing the free cells of the proembryo within the two eggs; X64; C, suspensors developing from the free cells, passing from the egg into the endosperm, and each bearing at the tip an embryonal cell; X64; D-F, later stages in the develop- ment of the embryo; XiS4; A, E. campylopoda; B-F, E. dltissima.—After Steas- BURGER (3). nucleus enlarges and becomes surrounded by delicate cytoplasmic radiations such as appear in connection with the unferti
. Morphology of gymnosperms. Gymnosperms; Plant morphology. Fig. 445.—Ephedra: A, young ovule; B, of female gametophyte after fertilization, showing the free cells of the proembryo within the two eggs; X64; C, suspensors developing from the free cells, passing from the egg into the endosperm, and each bearing at the tip an embryonal cell; X64; D-F, later stages in the develop- ment of the embryo; XiS4; A, E. campylopoda; B-F, E. dltissima.—After Steas- BURGER (3). nucleus enlarges and becomes surrounded by delicate cytoplasmic radiations such as appear in connection with the unfertilized egg, suggesting the possibihty of apogamy, but an investigation of thou- sands of ovules failed to discover any evidence that these egglike jacket nuclei ever function in the production of embryos. It is evi- dent that Miss Beertdge and Miss Sand ay (22) discovered the same situation in Ephedra distachya, although they interpreted it difiFer-. 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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