. The algae. Algae. EUPHYCOPHYTA 75. The cells, which are globose in shape and occasionally branched, are single, or else as many as four may be united into a group. Under certain cultural conditions branching may be copious. Each cell contains one chloroplast and there are no pyrenoids. The sole method of reproduction is through vegetative division in three planes when one may find up to fifty cells in a group. There is probably only one species, P. naegelii, all the other so-called species being reduced or modi- fied forms of other algae. The resistance of the cells to desiccation is aided b
. The algae. Algae. EUPHYCOPHYTA 75. The cells, which are globose in shape and occasionally branched, are single, or else as many as four may be united into a group. Under certain cultural conditions branching may be copious. Each cell contains one chloroplast and there are no pyrenoids. The sole method of reproduction is through vegetative division in three planes when one may find up to fifty cells in a group. There is probably only one species, P. naegelii, all the other so-called species being reduced or modi- fied forms of other algae. The resistance of the cells to desiccation is aided by a highly concentrated cell sap and a capacity to imbibe water directly from the air. Trentepohliaceae: Cephaleuros {cephal, head; euros, broad). Fig. 40 Fig 39 Pleurococcus naegelii. A, single cell. B, single-celled colony. C, normal colony. D-F, thread for- mation. (After Fritsch.). 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
