Microthamnion (Microthamniaceae)
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Diagnostic features
Branched filamentous chlorophyte with distinctive branching pattern, in which branches arise by the outgrowth of a cell below a crosswall (similar to branch formation in the much larger Cladophora). Cells at branch ends are rounded. Each cell contains a green parietal chloroplast lying along its length. Forms small tufts often attached to plant surfaces.