Genus: Filament without branching; cell body cylindrical; one or several chloroplasts band-shaped,
spirally arranged within the cell, pyrenoids present; septum with or without folded structure
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
About 300 species (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Vegetative cells (48-) 85-330 μm long,
(55-) 60-85 μm diam.,
3-4 chloroplasts making 1-3 turns in each cell
(Illustrations of The Japanese Fresh-water Algae, 1977).
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