Tolypothrix
About 40 species of Tolypothrix are described world-wide in habitats ranging from the tropics and subtropics to the Arctic. Tolypothrix is usually found in soft or acidic unpolluted freshwaters, and
may be planktonic, tangled in submergent vegetation, or growing on stones, macrophytes, or other algae. The filaments form mats in mineral springs, streams, alkaline swamps, or subaerial habitats. Benthic colonies may break free from the bottom and float to the surface.