. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . every direction of space, producing an irregular colony, often of large size (Apkanocapsa,Olceocapsa, Microcystis, etc.). In others the cells divide only in two directions in the sameplane, giving rise to a tabular colony (Merismopedia; fig. 26, B and (7); and in others celldivision takes place in one direction only (Synechococcus, Gloeot/iece). In the genusTetrapedia (fig. 26 D] the cells are compressed and very symmetrical. In Chroococcus(f
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . every direction of space, producing an irregular colony, often of large size (Apkanocapsa,Olceocapsa, Microcystis, etc.). In others the cells divide only in two directions in the sameplane, giving rise to a tabular colony (Merismopedia; fig. 26, B and (7); and in others celldivision takes place in one direction only (Synechococcus, Gloeot/iece). In the genusTetrapedia (fig. 26 D] the cells are compressed and very symmetrical. In Chroococcus(fig. 25) the mucous coats of the cells are often very firm and lamellose, and in Olceocapsa(fig. 2 B) the inner integuments often contain red, orange, or violet pigments. The largestcolonies are macroscopic and may contain many thousands of cells, as in Aphanotheceprasina. In Coelospheerium, Gomphosph&ria and Merismopedia the colonies are of limitedsize and definite shape, and in the two first-named genera a kind of budding takes placeby means of which a new colony is developed from the side of the old one, ultimatelybecoming separated from A
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