Genus: Subaerial algae; cell body without gelatinous coat; a single chloroplast cup-shaped with a pyrenoid
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
Cell body 10-20 (up to 40) μm in diam.,
zoospore 6-10 μm long, 3-5 μm wide
(Süßwasserflora von Mitteleuropa 10, Chlorophyta II, 1988).
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