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).
Trebouxia sp. (photobiont of lichen Caloplaca sp., orange lichen),
cell body spherical, up to 19 μm in diam.,
x 640, near Yanase river, Mizuko, Fujimi city, Saitama Pref., Japan, May 9, 2004 by Y. Tsukii
94 μm; x 640