Genus: Subaerial algae or a algal component of lichens; unicells; cell body 10-15 μm in diam.,
chlorplast(s) star-shaped or aggregated, with a single pyrenoid at the center
(Illustrations of The Japanese Fresh-water Algae, 1977).
Images of collecting locality:
Karakemi marsh, Yasaka, Omachi city (formerly Yasaka village), Nagano Pref., Japan, May 8, 2006 by Y. Tsukii