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 cellls 68-190 μm long,
50-80 μm diam.,
5-8 chloroplasts straight or slightly curved;
conjugation scalariform, tubes formed from both gametangial cells;
zygospores compressed spherical, 70-75 μm diam.,
medial spore wall thick, 3-5 μm in thickness,
brown, smooth when matured
(Photomicrographs of the Fresh-water Algae, 1985).
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