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A genus of dark green, or purplish black, filamentous, fresh-water algae, the threads of which have an automatic swaying or crawling motion. Called also Oscillatoria.

A genus of dark green, or purplish black, filamentous, fresh-water algae, the threads of which have an automatic swaying or crawling motion. Called also Oscillatoria.

A genus of algae, forming slimy moulds in stagnant water.

A genus of filamentous organisms composed of compactly arranged rows of cells separated by delicate transverse partitions. They occur in ponds, ditches, etc.[Lat.]