Family: Chloroplasts plate-like or ribbon-like; sexual reproduction by isogamy.
Genus: Without gelatinous sheath; filaments consist of many cells; rhizoid formed at one end
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species: cell body cylindrical or somewhat laterally swelled, 6-12 μm long, 8-12 μm wide;
a single chloroplast plate-like, parietal covering half of the cell wall, with a pyrenoid
(Illustrations of The Japanese Fresh-water Algae, 1977).
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