. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . numbers of zoogonidia coming to rest in one placeand germinating simultaneously. Much the largest species of the genus seems to be Lambert (10 A), which is epizootic on the Phyllopod Branchipus vernalis, thecells attaining a length of 480/x (fig. 141 A and B). Codiolum is marine or inhabits brackish water, occurring as a thin stratum on rocks,stones, the piles of harbours, and as a gregarious epiphyte on larger marine
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . numbers of zoogonidia coming to rest in one placeand germinating simultaneously. Much the largest species of the genus seems to be Lambert (10 A), which is epizootic on the Phyllopod Branchipus vernalis, thecells attaining a length of 480/x (fig. 141 A and B). Codiolum is marine or inhabits brackish water, occurring as a thin stratum on rocks,stones, the piles of harbours, and as a gregarious epiphyte on larger marine (with the possible exception of one species) is also a marine epiphyte. The genera are : Characium A. Braun, 1849 ; Codiolum A. Braun, 1849 ; SykidionWright, 1879; Characiella Schmidle, 1903. ffalosph&reae 215 [It is necessary to mention here the genus Ckaraciopsis founded by Borzi in 1895 toinclude a number of Algie previously described as species of Characium. It is distinguishedby the possession of two or more parietal chromatophores, the absence of pyrenoids, andthe storage of oil as a reserve ; it thus belongs to the Heterokontse.]. H Fig. 141. A and B, Characium graciliceps Lambert, x 540 ; A, typical specimen ; B, showingone of the early stages in the division of the protoplast; py, pyrenoids; r, —E, Characium Sieboldi A. Br.; C, vegetative cell; py, pyrenoid; D, large cell fromwhich zoogonidia are escaping laterally ; E, zoogonidium ; all x about 540. F—H, SykidionDroebakense Wille; F, formation of zoogonidia; G, showing formation of aplanospore ;H, zoogonidium ; all x 513. (A and B, after Lambert; C—E, after A. Brauu ; F—H, afterWille.) Sub-family ^E. This sub-family includes only the one genusHalosphasra Schmitz (1878), an Alga which is confined to the marineplankton. The cells are large and spherical (fig. 142 1 and #), attaining adiameter of 600 JJL, and Moat freely in the sea. The cell-wall is thin and thecytoplasm is mostl
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