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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50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
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