Genus: Cell body attached to others by gelatinous stalk emerging from anterior end; cell division occurs on the stalk forming dichotomously branching colony; pellicles soft but euglenoid movement rare; chloroplasts soucer-shaped in some species examined; a pyrenoid present at the center; a canal opened near anterior end; stigma present (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).

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C. vesiculosum 16-20 μm Saitama, 1999	C. vesiculosum 17 x 9 μm Toneri Park Tokyo, 2001	C. vesiculosum μm Zenko-ji Nagano, 2003	C. vesiculosum ? 15-21 x 11-14 μm Nagaike park Hachioji Tokyo, 2005
C. mucronatum 32 x 9 μm Kurihashi Saitama, 2001	C. mucronatum 25 x 7 μm Fukasaku-gawa Yusuichi Saitama, 2002
Colacium sp. ? or Characium ? 15 x 5 μm Saitama, 1999

Similar genus -->> Characium (Chlorophyta); Characiopsis (Heterokonta);

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