Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Species (var. crasa): Trichome straight or slightly curved, no constriction at cell-cell junction, 1.5-2 μm in diam.; cell body about 4-10 times longer than its width; septum indisinguishable (provably near pseudovacuoles) (Illustrations of the Japanese Fresh-water Algae, 1977).

Google Image Search

O. quasiperforata ? 9 x 2.5 μm diam. L/W=3.6 Uruido Hasuda Saitama, 2005	O. quasiperforata ? 7 x 2 μm diam. L/W=3.5 Saitama, 2000	O. quasiperforata 1 μm diam. L/W= Japan, 199?	O. quasiperforata 1 μm diam. L/W= Japan, 1999
O. quasiperforata ? x 2 μm L/W= Hasu-ike Shiga highland Nagano, 2005	O. quasiperforata μm diam. L/W= Naruto Chiba, 2003	O. quasiperforata 1 μm diam. L/W= Lake Kawaguchi Yamanashi, 2001	O. quasiperforata μm diam. L/W= Kashiwa Chiba, 2002
O. quasiperforata x 2 μm diam. L/W= Shiba river near Owada Park Saitama, 2005	O. quasiperforata ? 2 μm diam. L/W= Watarase river Ashikaga Tochigi, 2004	O. quasiperforata ? 1.5 μm diam. L/W= drainage ditch Fujimi Gunma, 2005	O. quasiperforata ? 2.0 μm diam. L/W= drainage ditch Kawajima Saitama, 2006
O. quasiperforata ? 2.5 μm diam. L/W= Kitamoto n.o.p. Kitamoto Saitama, 2006	O. quasiperforata ? μm diam. L/W= Iroha-numa Zao mountain Yamagata, 2006

Please click on species name for more images.

Copyright Protist Information Server