Family: Unicells or colonies of non-fixed number of cells; cell body variable in shape; one or more chloroplasts variable in shape; asexual reproduction by autospore or autocoenobium (Illustrations of The Japanese Fresh-water Algae, 1977).
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).
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Trochiscia sp.
cell 36-45 μm φ
near Karakemi m.
Omachi
Nagano, 2005
T. prescotti ?
cell 16 μm
Ueno
Tokyo, 2001
Trochiscia sp.
T. aspera ?
cell 10-12 μm φ
Yoshigadaira m.
Shirane mountain
Gunma, 2005
T. aspera
cell 8.5 μm
Ueno
Tokyo, 2001
