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).
Images of collecting locality:
Daini-koen (park), Tochigi city, Tochigi Pref., Japan, January 4, 2007 by Y. Tsukii