. The algae. Algae. 228 THE ALGAE tion. The last-named family differs from the other two in that some members at least possess a regular alternation of generations and there are differences in respect of the gonimoblasts and cystocarps. In the uncorticated uniaxial Chantransiaceae the genus Acro- chaetium is extremely widespread. Many of the species of Chan- transia are now known to be phases in the life cycle of Batracho- spermum species (see below). The marine Chantransia violacea and C. effiorescens are said to have alternation of haploid and diploid generations. In the genus Rhodochorton o
. The algae. Algae. 228 THE ALGAE tion. The last-named family differs from the other two in that some members at least possess a regular alternation of generations and there are differences in respect of the gonimoblasts and cystocarps. In the uncorticated uniaxial Chantransiaceae the genus Acro- chaetium is extremely widespread. Many of the species of Chan- transia are now known to be phases in the life cycle of Batracho- spermum species (see below). The marine Chantransia violacea and C. effiorescens are said to have alternation of haploid and diploid generations. In the genus Rhodochorton only the tetrasporic genera- tion is known. Study of Ufe cycles may assist in solving some problems and it is not urdikely that there are also problems of synonymy. * Batrachospermaceae : Batrachospermum (batracho, frog; sper- mum, seed). Fig. 125 Two genera commonly found in fresh waters, Batrachospermum and Lemanea, belong to the Nemalionales. B. moniliforme, which is a very variable species, is found attached to stones in swift-flowing waters of the tropics and temperate regions. The thallus, which is violet or blue-green in colour, is soft, thick and gelatinous, the primary axis, which grows from an apical cell, being formed of a / i W. 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
