. The algae. Algae. EUPHYCOPHYTA 249 Bostrychia, Plumaria). The order is the most highly evolved in the Rhodophyceae and is the only one in which the auxiliary cell is cut oflf after fertilization and as a direct consequence of the process. * Rhodomelaceae: Polysiphonia {poly, many; siphonia, siphons). Fig. 141 The thallus in this genus generally arises from decimibent basal filaments that are attached to the substrate by means of small. Fig. 141 Polysiphonia violacea. A, plant of P. nigrescens ( x ^). B, life cycle. C, apex and cells cut off from central cells. D, thallus construction in long
. The algae. Algae. EUPHYCOPHYTA 249 Bostrychia, Plumaria). The order is the most highly evolved in the Rhodophyceae and is the only one in which the auxiliary cell is cut oflf after fertilization and as a direct consequence of the process. * Rhodomelaceae: Polysiphonia {poly, many; siphonia, siphons). Fig. 141 The thallus in this genus generally arises from decimibent basal filaments that are attached to the substrate by means of small. Fig. 141 Polysiphonia violacea. A, plant of P. nigrescens ( x ^). B, life cycle. C, apex and cells cut off from central cells. D, thallus construction in longitudinal section. E, transverse section of thallus, P. fastigiata. f= young tetraspore. F, protoplasmic connections of axial thread. G-J, stages in development of carpospores. cp = carpogonium, a = auxiliary cell, ^ = gonimoblast, 5f= sterile cells ( X 400), (J X 260). K, cystocarp of P. nigrescens with ripe carpospores ( X 33). L, antheridial branch ( x 35). M, a-f, stages in development of antheridia. N, P. nigrescens, tetraspores ( x 33). (A, K, N, after Newton; B, after Svedelius; C, F, schematic; D, E, after Oltmanns; G-J, after Kylin; L, after Grubb; M, after Tilden.). 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
Size: 1534px × 1628px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookcollectionbiodiversity, booksubjectalgae
