Species: Trichome pale blue-green in color, straight or slightly twisted, without constriction at cell-cell junction, 2-2.5 μm wide; gradually tapering at curving terminal; cell body 2-3 times longer than its width (4-6 μm long; L/W=2-3); sometimes containing granules along septum (Illustrations of The Japanese Fresh-water Algae, 1977).

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O. lemmermannii 7 x 2-2.5 μm L/W=2.8-3.5 Numappara marsh Kuroiso Tochigi, 2003	O. lemmermannii 3-7 x 2.5 μm L/W=1.2-2.8 near Town Hall Shobu Saitama, 2004	O. lemmermannii ? or similar sp. 8-14 x 2.5-3 μm L/W= Mizuko Fujimi Saitama, 2003	O. lemmermannii ? 8 x 3 μm L/W=2.7 Kinchakuda Hidaka Saitama, 2004
O. lemmermannii ? 5-6.5 x 3 μm L/W=1.7-2.2 near Yamaguchi Univ. Yamaguchi, 2004	O. lemmermannii ? 6 x 3 μm L/W=2.0 Yoshigadaira m. Shirane mountain Gunma, 2005	O. lemmermannii 8-10 x 2.7 μm L/W=3.0-3.7 Futayo-no-ike Haguro mountain Yamagata, 2005

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