Tetrastrum
''Tetrastrum'' is a genus of green algae (Chlorophyta). It is a common component of the phytoplankton of freshwater habitats, particularly eutrophic and alkaline waters. Although traditionally classified in the family Scenedesmaceae in the class Chlorophyceae, it is phylogenetically more closely related to the genus '' Oocystis'' of the family Oocystaceae (Trebouxiophyceae). History The genus ''Tetrastrum'' has a tangled taxonomic history. The name was first coined in 1895 by Robert Chodat for the species '' Tetrastrum heteracanthum'', which was previously placed in the now-obsolete genus ''Staurogenia''. Later, the genus ''Cohniella'' was created by Ludwig Julius Bruno Schröder, containing the species ''Cohniella staurogeniiforme''. Later, Ernst Lemmermann merged the genus ''Cohniella'' into ''Tetrastrum''. Description ''Tetrastrum'' consists of four-celled colonies, which are sometimes aggregated together to form compound colonies. A layer of mucilage surrounding the col ...
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