Genus: A single trichome within a rigid sheath; sheath clear or yellowish; filaments planktonic or
agglutinated.
Species: Trichome blue-green, twisted or straight, not attenuated toward ends,
septum constricted, rows of granules absent, easily separated into single cells,
cell body 2.3-16 μm long, 2.3-4 μm wide;
(Illustrations of The Japanese Fresh-water Algae, 1977).
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