. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . 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. Brann, 1849 ; Codiolum A. Broun, 1849 ; St/kidionWright, 1879; ChftrnrMfa Schmidle, 1903. Halosplixrese 215 [It is necessary to mention here the genus Characiopsis foun
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . 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. Brann, 1849 ; Codiolum A. Broun, 1849 ; St/kidionWright, 1879; ChftrnrMfa Schmidle, 1903. Halosplixrese 215 [It is necessary to mention here the genus Characiopsis founded by Borzi in 1895 toinclude a number of Algye 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 Bone of the early B, Characium graciUceps Lambert, x 540 ; A, typical specimen ; B, showingdy stages in the division of the protoplast; py, pyrenoids; r, rhizoids. C—E, Characium Sieboldi A. Br.; C, vegetative cell; ; D, large cell fromwhich zoogonidia are escaping laterally ; E, zoogonidium ; all x about 540. F—H, SykidionDroebakense Wills; F, formation of zoogonidia; G, showing formation of aplanospore ;H, zoogonidium ; all x 513. (A and B, after Lambert; C— K, after A. Braim ; F— H, afterWille.) Sub-family HALOSPH^EREyE. This sub-family includes only the one genusHalosphwra Schmitz (1878), an Alga which is confined to the marineplankton. The cells are large and spherical (fig. 142 1 and 3), attaining adiameter of 600 /j,, and float freely in the sea. The cell-wall is thin and thecytoplasm is mostly in a parietal layer. There is one nucleus, usually in theparietal cytoplasm but occasionally occupying a central position, in whichcase the small
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