. Morphology of gymnosperms. Gymnosperms; Plant morphology. Figs. 350-352.—Pinus Laricio: three stages in the formation of the proembryo; fig. 350, four nuclei (two shown) at base of fertilized egg, showing the fibers which had been mistaken for a wall; X225; fig. 351, division of the nuclei shown in previous figure, indicating that no wall is formed at the four-nucleate stage; X355; fig. 352, late telophase of the mitosis the anaphase of which is shown in the previous figure; the transverse walls are nearly complete and the vertical walls, formed on the radiating fibers which are already beco
. Morphology of gymnosperms. Gymnosperms; Plant morphology. Figs. 350-352.—Pinus Laricio: three stages in the formation of the proembryo; fig. 350, four nuclei (two shown) at base of fertilized egg, showing the fibers which had been mistaken for a wall; X225; fig. 351, division of the nuclei shown in previous figure, indicating that no wall is formed at the four-nucleate stage; X355; fig. 352, late telophase of the mitosis the anaphase of which is shown in the previous figure; the transverse walls are nearly complete and the vertical walls, formed on the radiating fibers which are already becoming conspicuous in fig. 351, are developing; X350.— After Miss Kildahl (129). plete (fig. 348). It consists, therefore, of twelve walled cells and four open ones, arranged in four uniform tiers of four cells each. The functions of the tiers are definitely distributed; the lowest forming the embryo proper, the tier next above elongating to form the suspen- sor, and the third walled tier constituting the so-called "rosette,". 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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