Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Trichome nearly straight, slightly tapered toward both ends, without constriction at septum, 4-6 μm wide; cell body 2.5-4 μm long, granules present along septum; pseudovacuoles also present; terminal cells variable in shape, sometimes form conical-shaped calyptra, or rounded (Illustrations of The Japanese Fresh-water Algae, 1977).

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O. agardhii 3-6 x 6.5 μm L/W=0.5-0.9 Kurome river Asaka Saitama, 2004	O. agardhii 6 μm φ L/W= Tama river Chofu Tokyo, 2004	O. agardhii 2-4 x 6 μm L/W=0.3-0.7 Shinrin-koen Namegawa Saitama, 2005	O. agardhii 2.5-5.0 x 6 μm L/W=0.42-0.83 Toyonodai park Otone Saitama, 2006
O. agardhii 2-4 x 6 μm L/W=0.3-0.7 Banpaku memorial p. Tsukuba Ibaraki, 2006	O. agardhii 2.5-4.5 x 5.5 μm L/W=0.4-0.8 Koga general park Koga Ibaraki, 2003	O. agardhii 5.5 μm φ L/W= Midori-no-oka p. Matsubushi Saitama, 2004	O. agardhii 5.5 μm φ L/W= Mizuko-kaizuka p. Fujimi Saitama, 2004
O. agardhii 5.5 μm L/W=0.4-0.7 Nanbata castle p. Fujimi Saitama, 2004	O. agardhii 5.5 μm L/W=0.55-1.1 Oura central p. Oura Gunma, 2006	O. agardhii 3-5 x 5 μm L/W=0.6-1.0 Naruto Chiba, 2003	O. agardhii 5.5 μm L/W= Kodai-hasu p. Gyoda Saitama, 2006
O. agardhii 5 μm φ L/W= Yanase river Fujimi Saitama, 2004	O. agardhii 3.5-4 x 4.5 μm L/W= Ohmido Kamisato Saitama, 2004	O. agardhii ? 1.5-3.0 x 6.5 μm L/W=0.2-0.5 Asa-kawa Hachioji Tokyo, 2005	O. agardhii ? 2.5-4 x 6 μm L/W=0.4-0.7 Shide-numa Kita-kawabe Saitama, 2005
O. agardhii 4 x 5 μm L/W=0.8 Hasu-ike Shiga highland Nagano, 2005	O. agardhii 3-6 x 4.5 μm L/W=0.7-1.3 Tanohara Natural p. Ontake highland Nagano, 2005	O. agardhii 10 x 4 μm L/W=2.5 Tanohara Natural p. Ontake highland Nagano, 2005

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