Family: Filamentous algae without branching; cell body cylindrical or fusiform swelled at the center;
a single or many chloroplasts plate-like or small disc-shaped
(Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Soil algae; "H" structure of the cell wall inconspicuous (Illustrations of The Japanese Fresh-water Algae, 1977).
Images of collecting locality:
Ushiku-Ayame-en (garden of Iris sanguinea), Ushiku city, Ibaraki Pref., Japan, March 27, 2007 by Y. Tsukii