Species: Colonies of 16 cells arranged with equal distances; interspace present between gelatinous coats of the cells; cell body ovoid or ellipsoid in shape, 10-13 μm in diam.; chloroplast with a single pyrenoid (Illustrations of The Japanese Fresh-water Algae, 1977).

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G. formosum colony of 16 cells colony 43-95 μm cell 7-16 μm cells separated Ueno Tokyo, 2001	G. formosum colony of 16 cells colony μm cell μm cells separated Iruma Saitama, 2003	G. formosum ? colony of 16 cells colony μm cell μm Mizuko Fujimi Saitama, 2003	G. formosum colony of 16 cells colony 70 μm cell 13 μm Yokonuma Sakado Saitama, 2004
G. formosum ? colony of 16 cells colony 53 μm cell 10 μm Ikenokochi marsh Tsuruga Fukui, 2004	G. formosum ? colony of 16 cells colony 80 μm cell 16 x 13 μm Noda Higashi-matsuyama Saitama, 2004	G. formosum cell 11 x 10 μm Shimo-muneoka Shiki Saitama, 2004	G. formosum cell 9 x 8 μm Murakuni ike Iwatsuki-bunka p. Saitama, 2006
G. formosum colony μm cell 14 μm Kodanuki marsh Fujinomiya Shizuoka, 2006	G. formosum colony μm cell 9 μm Ohnuma Nasu-shiobara Tochigi, 2007	G. formosum colony μm Old Sugata R. Mibu Tochigi, 2008

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