Family: Colonies consisting of a fixed number of cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Planktonic; colony of 128 or 64 cells located at the periphery of a gelatinous matrix; 1/5 or 1/4 of the cells small, non-reproductive distinct from other large reproductive cells; cell body nearly spherical; a single chloroplast cup-shaped, with a single or many pyrenoids (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).

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P. californica stock Ito-1 Otto-Numa Tsuchiura Ibaraki, 2002	P. californica stock Ito-1 colony inversion Tsuchiura Ibaraki, 2002	P. californica col. 320 μm cells 32, 12 μm Koegawa Konan Saitama, 2004	P. californica col. 200 μm cells 16, 10 μm Aquatic botanical g. Sawara Chiba, 2004
P. californica col. 240 μm cells 20, 10 μm near Uehara-ike Ueda Nagano, 2006	P. japonica col. 360 μm cells μm Aquatic botanical g. Sawara Chiba, 2004	P. japonica col. 150 x 142 μm cells 8-12 μm Takasuga-ike Satte Saitama, 2001

Similar genus -->> Eudorina;

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