Genus: Filament without branching; cell body cylindrical; each cell wall consists of two parts with "H" structure
overlapping at the midregion; chloroplasts many, disc-shaped, without pyrenoids
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species:
Filament 10-12-(-15) μm wide
(Süßwasserflora von Mitteleuropa 3, Xanthophyceae 1, 1978).
Filament 8-12 μm wide; many chloroplasts in each cell
(Illustrations of The Japanese Fresh-water Algae, 1977).
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