. The algae. Algae. ii8 THE ALGAE plants. The cells, which have a cellulose membrane, contain dis- coid chloroplasts without any pyrenoids together with one nucleus. Cytoplasmic streaming is very readily observed, especially in the. Fig. 68 Charales. A, B, stages in development of antheridium of Chara. 1-3, segments and cells to which they give rise. C, section of almost mature antheridium of Nitellaflexilis. b = flask cell, c = extra basal cell. D, C. tomentosUi single plate with manubrium and spermatogenous threads. E, C. tomentosa, apex of manubrium with spermatogenous threads, a = primary
. The algae. Algae. ii8 THE ALGAE plants. The cells, which have a cellulose membrane, contain dis- coid chloroplasts without any pyrenoids together with one nucleus. Cytoplasmic streaming is very readily observed, especially in the. Fig. 68 Charales. A, B, stages in development of antheridium of Chara. 1-3, segments and cells to which they give rise. C, section of almost mature antheridium of Nitellaflexilis. b = flask cell, c = extra basal cell. D, C. tomentosUi single plate with manubrium and spermatogenous threads. E, C. tomentosa, apex of manubrium with spermatogenous threads, a = primary head cell, b = secondary head cell. F-I, C. foetida, stages in formation of antherozoids in sper- matogenous threads. J, mature antherozoid. (A, B, after Goebelj C-E, J, after Grove; F-I, after Fritsch.) internodal cells. Sexual reproduction is by means of a character- istic oogamy where Ught intensity plays a part in determining the production of the sex organs. The species are either dioecious or monoecious, in which latter case the oogonia and antheridia are juxtaposed, the oogonia being directed upwards and the antheridia downwards, both organs usually appearing on secondary lateral branches of limited 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 Chapman, V. J. (Valentine Jackson), 1910-. London, Macmillan; New York, St. Martin's Press
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Keywords: ., bo, bookcentury1900, bookcollectionbiodiversity, booksubjectalgae