Family: Unicellar; cylindroid; spiny protrusion at one end.
Genus: Unicellular, attached on a substrate at one end of the cell; cell body slightly curved, ovoidal or cylidrical in shape; 1 or two chloroplasts plate-like, without pyrenoids (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).

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C. saccata ? 30-38 x 6-8 μm near City Hall Fujimi Saitama, 2004	Characiopsis sp. 62 x 7 μm Sanda Hyogo, 2001	C. borziana ? 37 x 6 μm Shinobazu-ike Tokyo, 2001	C. borziana ? 47 x 5.5 μm Akigase Park Saitama, 2002
C. borziana ? μm Inari Park Toyama, 2002	Characiopsis sp. C. borziana ? 27 x 4 μm Akigase Park Saitama, 2002	Characiopsis sp. C. borziana ? 27-35 x 5-7 μm Kasama Park Ibaraki, 2002
C. tuba or C. pyriformis ? 18-26 x 6-10 μm Onnenai Kushiro marsh Hokkaido, 2005	C. pyriformis or Peroniella ? 23 x 7 μm Toneri Park Tokyo, 2001	C. acuta 18-31 x 5-7 μm Onnenai Kushiro marsh Hokkaido, 2005
Characiopsis sp. or Stigeoclonium ? μm Akebono-yama A.P. Kashiwa Chiba, 2002	Characiopsis sp. ? μm Midorigaoka park Sukagawa Fukushima, 2003

Similar genus -->> Characium; Chlorothecium;

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