Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Trichome without constriction; cell body elongated, 3-7 μm long, 1.5-2 μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977).

O. acutissima ? 3-6.5 x 1.2 μm L/W=2.5-5.4 Furu-tone river Kasukabe Saitama, 2004

O. acutissima ? 3-5 x 2 μm L/W= Senuki Nasu Tochigi, 2004

Similar species -->> O. splendida;

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