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 66-200 μm long, 40-50 μm diam.;
1 chloroplast making 3-5 turns in each cell; conjugation scalariform,
tubes formed from both side; zygospores broad or short ellipsoidal, 50-83 μm long,
40-50 μm wide, internal layer yellowish, spre-surface smooth
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