Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Trichome straight, with a constriction at cell-cell junction, 1.5 μm in diam.; cell body elongated, 4-12 μm long, L/W=2.5-8 (Illustrations of The Japanese Fresh-water Algae, 1977).
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O. limnetica ?
2-4 x 1.5 μm
L/W=1.3-2.7
Takasaka
Higashi-Matsuyama
Saitama, 2002
O. limnetica ?
1.5 μm φ
L/W=
Central Park
Tsukuba
Ibaraki, 2002
O. limnetica ?
or O. neglecta ?
2-4 x 2 μm φ
L/W=
Kinchakuda
Hidaka
Saitama, 2004
