Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Trichome straight, without constriction at cell-cell junction, tapering at both ends, 4-6.5 μm wide; cell body short, 1.5-3 μm long (1/3-1/2 of its width; 0.3-0.5); granules present along septum (Illustrations of the Japanese Fresh-water Algae, 1977).

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O. brevis or O. priestleyi ? 7.5 μm φ L/W=0.4-0.8 Shishizuka Tsuchiura Ibaraki, 2003	O. brevis or O. priestleyi ? 7 μm φ L/W=0.4-0.8 Kurome river Asaka Saitama, 2004	O. brevis 6 μm φ L/W=0.4-0.8 Ta river Ishibashi Tochigi, 2004	O. brevis 2-4 x 7 μm φ L/W=0.3-0.6 Kamigo ni-ku Ishibashi Tochigi, 2004
O. brevis 2-4 x 7.5 μm φ L/W=0.3-0.5 Tsukamoto Sakura-ku Saitama, 2004	O. brevis ?? 5.5 μm φ L/W=0.3-0.5 Hasuda Saitama, 2002	O. brevis ? 5.5 μm φ L/W=0.45-0.91 Tobai-numa n.p. Kawajima Saitama, 2006	O. brevis ? 5.5 μm φ L/W=0.45-0.91 Toyonodai park Otone Saitama, 2006
O. brevis ? 5 μm φ Kodai-hasu p. Gyoda Saitama, 2006

Similar species -->> O. priestleyi (5-6 μm φ L/W=2/3);

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