Genus: Colonies spherical or aggregates in shape; sheath conspicuous; cell body spherical in shape;
chloroplasts cup-shaped or plate-like (Illustrations of the Japanese fresh-water algae, 1977).
Gloeocystis gigas ?,
cell body μm long, μm wide,
x 640, near Yanase river, Mizuko, Fujimi city, Saitama Pref., Japan, December 2003 by Y. Tsukii
94 μm; x 640