Species: Trichome straight, without constriction at cell-cell junction, 8-9 μm wide; cell body short, 2-4 μm long, L/W=1/4-1/2; granules absent along septum (cf. granules present -> O. irrigua, O. nigra); terminal cells semicircular (Illustrations of the Japanese Fresh-water Algae, 1977).

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O. simplicissima ? 5-9 x 11 μm L/W=0.45-0.82 Dewa Park Koshigaya Saitama, 2006	O. simplicissima ? 5-10 x 10 μm L/W=0.5-1.0 Kashibaru marsh Karatsu Saga, 2006
O. simplicissima ? 2.5-5 x 10 μm L/W=0.3-0.5 Watarase river Ashikaga Tochigi, 2004	O. simplicissima or O. irrigua ? 2.5-5 x 10 μm L/W=0.3-0.5 rice field Shinano Nagano, 2004	O. simplicissima ? 6 x 10 μm φ L/W=0.6 Mihashi g.p. Omiya-ku Saitama, 2004	O. simplicissima ? 3-6 x 10 μm φ L/W=0.3-0.6 Demaru-nakago Kawajima Saitama, 2005
O. simplicissima ? 4-8 μm φ L/W=0.36-0.73 Oura central p. Oura Gunma, 2006	O. simplicissima ? or O. nigra ? 8.5 μm φ L/W=0.53-0.65 Senjo-ga-hara Nikko Tochigi, 2003	O. simplicissima ? or O. nigra ? 8.5 μm φ L/W=0.4 Senjo-ga-hara Nikko Tochigi, 2003	O. simplicissima ? 8.5 μm φ L/W= Yanome-dam park Nasu Tochigi, 2004
O. simplicissima ? 7.5 μm φ L/W= Kashiwa Chiba, 2002	O. simplicissima ? 7 μm φ L/W= Usui river Takasaki Gunma, 2004	O. simplicissima 7 μm φ L/W=0.35-0.70 Ebukuro-numa Kumagaya Saitama, 2008	O. simplicissima ? 2-4 x 7 μm φ L/W= Konuma Sakado Saitama, 2004
O. simplicissima ? 2-3 x 7.5 μm L/W= Higashi-sano Hakuba Nagano, 2004	O. simplicissima ? 2-4 x 7 μm L/W= Riverside green l. Sawara Chiba, 2004	O. simplicissima ? 2-4 x 7 μm L/W=0.3-0.6 near Shide-numa Kita-kawabe Saitama, 2005	O. simplicissima ? x 8 μm L/W=0.3-0.6 Numa-no-hara m. Madarao highland Niigata, 2005
O. simplicissima ? x 7 μm L/W= Numa-no-hara m. Madarao highland Niigata, 2005
O. simplicissima ? 4-6 x 8 μm L/W=0.5-0.8 Hakama marsh Madarao highland Niigata, 2005

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