Genus: Solitary or colonial; body surface delicate; one to two chloroplasts; usually with a stigma; fresh water (Kudo, 1966). One to several chloroplasts; pyrenoid and/or eyespot (stigma) in some; cells naked, globular, ellipsoidal or pyriform (Illustrated Guide, 1985).
Species: Cell body 19-27 μm long, 12-18 μm wide (Starmach 1985).

->> Description at WPRNO

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O. verrucosa 24 μm Tanohara Natural p. Ontake highland Nagano, 2005	O. verrucosa μm Ushidome-ike Norikura highland Nagano, 2007	O. verrucosa 23 x 21 μm Numa-no-hara m. Madarao highland Niigata, 2007	O. verrucosa μm Omine-numa 1 Minakami Gunma, 2008
O. verrucosa μm Kareki-numa Nikko Tochigi, 2008	O. verrucosa μm Shijuhachi-ike 1 Shiga highland Nagano, 2008

Similar Species ->> O. pinguis (10-12 μm long)
Similar Genus ->> Monas

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