. Nature and development of plants. Botany. 212 SEXUAL REPRODUCTION OF RED ALGAE duction outlined above is complicated in the majority of the red algae, owing to the fusion of the germinating gametospore with adjacent cells that contain storage foods and from certain of these storage cells the characteristic spore producing branches are developed. In this way, the formation of a larger number of spores is made possible by a single fecundation. Frequently. Fig. 126. Sexual reproduction in Nemalion: A, tip of branch bearing female gametangium, c, and cluster of male garaetangia, an, from some of
. Nature and development of plants. Botany. 212 SEXUAL REPRODUCTION OF RED ALGAE duction outlined above is complicated in the majority of the red algae, owing to the fusion of the germinating gametospore with adjacent cells that contain storage foods and from certain of these storage cells the characteristic spore producing branches are developed. In this way, the formation of a larger number of spores is made possible by a single fecundation. Frequently. Fig. 126. Sexual reproduction in Nemalion: A, tip of branch bearing female gametangium, c, and cluster of male garaetangia, an, from some of which the motionless male gametes are escaping. B, first division of the germinating gametospore, g. C, later stage showing the early formation of the branches from which the spores will be developed. D, spores forming at the ends of the numerous branches. a sac-like structure, the cystocarp, is developed about the spores owing to the outgrowths of the adjacent cells (Fig. 127, C). Atten- tion should be fixed upon the form of the female gametangium and the sac-like structure of the cystocarp because you will see these features reappear in certain groups of the fungi. The spores formed from the growth of the gametospore are finally set free and grow into plants resembling the gamete bearing red algae but singularly these plants only produce spores—never gametangia. These spores are formed in fours in a single cell (Fig. 128) and therefore called tetraspores. These spore-forming cells arise singly on the surface or in the tissues. 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
Size: 1898px × 1316px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisher, booksubjectbotany