. Nature and development of plants. Botany. Fig. 255. Development of the pro-embryo of pine: A, section of an ar- chegonium at time of fertilization. One of the male gametes, cf, is seen fusing with the female, 9. The second male gamete, o"^, the tube nucleus, and the wall cell are also shown near the neck of the archegonium. B, the gametospore has germinated, forming four cells, which are passing to the upper end of the sac. C, the cells shown in B, arranged at end of sac and in process of division (only two cells in this sectional view). D, later stage, the pro-embryo of four plates of
. Nature and development of plants. Botany. Fig. 255. Development of the pro-embryo of pine: A, section of an ar- chegonium at time of fertilization. One of the male gametes, cf, is seen fusing with the female, 9. The second male gamete, o"^, the tube nucleus, and the wall cell are also shown near the neck of the archegonium. B, the gametospore has germinated, forming four cells, which are passing to the upper end of the sac. C, the cells shown in B, arranged at end of sac and in process of division (only two cells in this sectional view). D, later stage, the pro-embryo of four plates of cells. E, the second plate or suspensory cells, s, of the pro-embryo elongating, thus pushing the embryo-forming cells, e, into the tissues of the female gametophyte.—A after Ferguson; B-E after Coulter and Chamberlain. motility as a result of this new method of transport to the female gamete. (d) Development of the Sporophyte.—The germination of the gametospore of the pine will illustrate the more important features in the process. The nucleus of the gametospore divides a varying number of times, commonly forming four nuclei (Fig. 255, B), which pass to the upper end of the spore and arrange. 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisher, booksubjectbotany
