. Morphology of gymnosperms. Gymnosperms; Plant morphology. 2S6 MORPHOLOGY OF GYMNOSPERMS solitary in Taxodium {'j6), three or four in Crypiomeria (93), and five or six in Sequoia (92); and among the Cupressineae, Thuja (86) occasionally has two or three mother cells, and Libocedrus (131) one to three. That the number of mother cells may be quite variable is shown by the case of Cunninghamia, in which one observer (64) reported several mother cells developing embryo sacs, and another. Fig. 280.—Firms Laricio: longitudinal section of an ovule on June i, with mega- spore mother cell in the cente
. Morphology of gymnosperms. Gymnosperms; Plant morphology. 2S6 MORPHOLOGY OF GYMNOSPERMS solitary in Taxodium {'j6), three or four in Crypiomeria (93), and five or six in Sequoia (92); and among the Cupressineae, Thuja (86) occasionally has two or three mother cells, and Libocedrus (131) one to three. That the number of mother cells may be quite variable is shown by the case of Cunninghamia, in which one observer (64) reported several mother cells developing embryo sacs, and another. Fig. 280.—Firms Laricio: longitudinal section of an ovule on June i, with mega- spore mother cell in the center, surrounded by a region of more or less modified cells; nucleus of mother cell in prophase of reduction division; Xsoo. (147,180) reported a solitary mother cell. The season for the recog- nition and functioning of mother cells has been mentioned, ranging throughout all the spring months for different latitudes, but there is no clear evidence whether in any case the megasporangium passes the winter in the mother cell stage, as is often true of the microsporangium. A well-marked feature of the Pinaceae is the development of a more or less extensive zone of nutritive cells about the enlarging. 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
Size: 1459px × 1713px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherchicagouniversityo
