Genus: Subaerial algae; cell body without gelatinous coat; a single chloroplast cup-shaped with a pyrenoid
(Illustrations of The Japanese Fresh-water Algae, 1977).
cell body spherical, 12-19 μm in diam., a single pyrenoid present in each cell,
x 640, Kaga city, Ishikawa Pref., Japan, 2000, by Y. Tsukii
94 μm; x 640
Cells flattened by pressing with coverglass