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. or
cell body spherical, 6-12 μm in diam.,
chloroplasts parietal with one large pyrenoid,
x 400, x 640, Kawagoe, Saitama Pref., Japan, July 2001 by Y. Tsukii
94 μm; x 640