. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . ion of space, producing an irregular colony, often of large size (Aphanocapsa,(Jloeocapsa, Microcystis, etc.). In others the cells divide only in two directions in the sameplane, giving rise to a tabular colony (Merismopcdia ; lig. 26, H and (7); and in others celldivision takes place in one direction only (Si/nechococcus, Glceotkece). In the genusTetrapedia (fig. 26 D) the cells are compressed and very symmetrical. In Chroococcus(fig. 25) th
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . ion of space, producing an irregular colony, often of large size (Aphanocapsa,(Jloeocapsa, Microcystis, etc.). In others the cells divide only in two directions in the sameplane, giving rise to a tabular colony (Merismopcdia ; lig. 26, H and (7); and in others celldivision takes place in one direction only (Si/nechococcus, Glceotkece). 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 laruellose, and in Glceoc* <(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 Ccelosphserium, Gomphosphseria and Merismopcdia 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 ; »
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