Genus: Thalli branched uniseriate filamentous; attached by a basal cell with a small holdfast; cells cylindrical
or sometimes subclavate; terminal cells with bluntly rounded end; chloroplasts a single, parietal plate-like;
without pyrenoids (Photomicrog. Fresh-w. Alg. 4, 1985).
Images of collecting locality:
No. 5, Okahotto-Yatsu Museum (a biotope including rice field), Okahotto, Abiko city, Chiba Pref., Japan, February 17, 2008 by Y. Tsukii