|  Genus: 
Filamentous algae without branching; a single plate-like chloroplast in each cell 
(Illustrations of The Japanese Fresh-water Algae, 1977). Species: 
Cell body 30-140 μm long, 8-13 μm wide; 
4-8 pyrenoids in each cell; zygotes spherical, 13-25 μm diam. 
(Illustrations of The Japanese Fresh-water Algae, 1977).
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