Genus: Filament without branching; cell body very long, cylindrical in shape,
with many ring-shaped chloroplasts; sexual reproduction by oocyte and sperm
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Filamentous algae without branching; cell body cylindrical, very long, 300-500
μm long, 30-50 μm wide, with many nuclei
(Illustrations of The Japanese Fresh-water Algae, 1977).
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