Family: Unicells; cell body spherical or broad ellipsoidal; chloroplasts 1 to several in number, cup-shaped or plate-like, reticulated or star-shaped; with or without pyrenoids; reproduction by autospores and zoospores; many species found in soil (Illustrations of The Japanese Fresh-water Algae, 1977).
Genus: Unicellular; cell body ellipsoidal or spindle-shaped, attached on a substrate at one end; a single chloroplast plate-like in shape, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).

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C. sieboldii 54 μm Shimo-kawahara p. Sayama Saitama, 2005	C. sieboldii ? 50 x 16 μm Tsuki river Ogawa Saitama, 2007	C. pringsheimii 21 x 6 μm Gyoda Saitama, 2001	C. pringsheimii 36 x 10 μm Sanda Hyogo, 2001
Characium sp. μm O-ike park Yabuki Fukushima, 2003	Characium sp. 13 x 3 μm near Shide-numa Kita-kawabe Saitama, 2005	Characium sp. μm Zenko-ji Nagano, 2003	C. rabenhorstii ? or Xanthophyceae ? 30 x 6 μm Musashi-urawa Saitama, 2001
Characium sp. or Characiochloris ? 21-23 x 9-13 μm Hamasaki Asaka Saitama, 2004	Characium sp. 21 x 9 μm Hamasaki Asaka Saitama, 2004	Characium sp. or Characiopsis ? 31 x 10 μm Yamaguchi Univ. Yamaguchi, 2004	Characium sp. ? 40, 72 μm near Owada Park Saitama Saitama, 2005
Characium sp. ? 100 μm Asa-kawa Hachioji Tokyo, 2005	Characium sp. ? 38 x 13 μm Urawa Minkaen m. Midori-ku Saitama, 2006	Characium sp. ? or Characiochloris ? 38 x 14 μm Japan, 1999	Characium sp. ? or Characiochloris ? μm Showa-machi g.p. Showa Saitama, 2003
C. ambiguum μm near R272 Minakami Gunma, 2007	Characium sp. ? μm G. Suigo p. Itakura Gunma, 2003

Similar genus --> > Colacium; Characiopsis; Characiochloris; Hydiranum;

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