Family: Trichome (filamentous structure) lacks heterocysts; with equal diameter throughout whole length; no hair-like structure; no branching.
Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cells 16-60 μm (usually 40-50 μm) in diam., 3.5-7 μm long (Photomicrographs of the Freshwater Algae, vol. 4, 1985).

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O. princeps 6 x 47 μm L/W=0.12 Sashi-ohgi Saitama, 2002	O. princeps 4.5-9 x 47 μm L/W=0.1-0.2 Higashi-sano Hakuba Nagano, 2004	O. princeps x 47 μm L/W= Takano-ike Mito Ibaraki, 2003	O. princeps 7 x 47 μm Ikenokochi m. Tsuruga Fukui, 2006
O. princeps 5-8.5 x 41 μm L/W=0.12-0.21 O-ike park Yabuki Fukushima, 2003	O. princeps 4.3 x 38 μm L/W=0.11 Japan, 1999	O. princeps 6 x 37 μm L/W=0.16 Sayama Saitama, 2001	O. princeps x 28 μm L/W= Senjo-ga-hara Nikko Tochigi, 2003
O. princeps 4 x 31 μm L/W=0.1 Futayo-no-ike Haguro mountain Yamagata, 2005	O. princeps v. minor ? 3 x 13 μm L/W=0.2 near Mihashi Park Saitama, 2006

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