Genus: Subaerial algae; cell body without gelatinous coat; a single chloroplast cup-shaped with a pyrenoid
(Illustrations of The Japanese Fresh-water Algae, 1977).
stock Cka-1, axenic culture with KCM & Hyponex (June 14 to July 31, 2003),
cell body μm long, μm wide,
x 640, Akebono-yama (mountain) Agricultural Park, Kashiwa city, Chiba Pref., Japan, November 2002 by Y. Tsukii
31 μm 63 μm 94 μm; x 640