|  Genus: 
Filamentous algae without branching; a single plate-like chloroplast in each cell 
(Illustrations of The Japanese Fresh-water Algae, 1977). Species: 
vegetative cells 40-180 μm long, 
20-34 μm diam., 
4-10 pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977).
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