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Chlorophyceae: Chlorococcales: Oocystaceae

Trochiscia aspera
(Reinsch) Hansgirg

Trochiscia Genus: Unicells; cell body spherical in shape; cell wall warty or wrinkled (Illustrations of The Japanese Fresh-water Algae, 1977).
Cell wall with warts or a network of ridges or lines (Dillard, Common Freshwater Algae of the United States, J. Cramer 1999).

Species: Cell body spherical, 15-25 μm in diam.; cell wall warty (covered with many short conical projections); 2-3 chloroplasts without pyrenoids; subaerial or planktonic (Illustrations of The Japanese Fresh-water Algae, 1977).
15-20 μm in diam.; 2-3 plate-like chloroplasts present, without pyrenoids; cell wall covered with many short conical projections (or warts) (Introduction to the Freshwater Algae, 1999).

Trochiscia aspera ? (Oocystaceae, Chlorococcales, Chlorophyceae), cell body spherical, 8.5 μm in diam., x 640, Shinobazu-ike (pond), Ueno, Taito-ku, Tokyo, Japan, March 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Trochiscia Trochiscia

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