Genus: Without gelatinous sheath; filaments consist of many cells; rhizoid formed at one end
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body large,30-60 μm in diam., 15-30 μm long;
constriction conspicuous at the cell junction; cell wall thick, partly multi-layered
(Illustrations of The Japanese Fresh-water Algae, 1977).
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