|  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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