Order: Filamentous algae without branching; cell body mostly cylindrical.
Family: Chloroplasts plate-like or ribbon-like; sexual reproduction by isogamy.
Genus: (Illustrations of the Japanese Freshwater Algae, 1977).
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R. conjunctivum
5-6 x 8 μm
Tane-ike
Togakushi highland
Nagano, 2006
