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 66-198 μm long, 10-14 μm diam.;
1 chloroplast making 3.5-6 turns in each cell; conjugation scalariform,
female gametangium swelled; zygospores elliptical (44-62 μm long, 20-28 μm wide)
(Illustrations of The Japanese Fresh-water Algae, 1977).
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