Species: Colonies linear filaments consisting of 10-20 cells; cell body short cylindroid, both ends rounded, 15-20 μm long, 8-10 μm in diam.; cells separated each other; a single chloroplast plate-like, with a pyrenoid (Illustrations of the Japanease Freshwater Algae, 1977).
The thickness of the gelatinous sheath variable; planktonic; cell body ellipsoidal or cylindrical with rounded ends, 25-35 μm long, 9-20 μm in diam.; cells scarcely adherent to each other or equally separated on another; chloroplasts a single, plate-like forming a girdle, with a pyrenoid (Photomicrographs of the Fresh-water Algae, vol. 3 (1985).

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Cell body more than 10 μm in diam.
G. mutabilis 20-34 x 15 μm Tashirodaira m. Hakkoda mountain Aomori, 2005	G. mutabilis 18-34 x 16.5 μm Tashirodaira m. Hakkoda mountain Aomori, 2006	G. mutabilis 25-32 x 15.5 μm near Iroha-numa Zao mountain Yamagata, 2006
G. mutabilis 18-23 x 18 μm Numappara marsh Kuroiso Tochigi, 2003	G. mutabilis 22-28 x 18-20 μm Numappara marsh Kuroiso Tochigi, 2003	G. mutabilis μm Numappara marsh Nasu-shiobara Tochigi, 2007	G. mutabilis μm Ohnuma Nasu-shiobara Tochigi, 2008
Cell body less than 10 μm in diam.
G. mutabilis 5-12 x 7 μm Koshigaya Saitama, 2001	G. mutabilis stock Skg-1 4-10 x 7 μm Koshigaya Saitama, 2001	G. mutabilis stock Skg-1 7-14 x 8.5 μm Koshigaya Saitama, 2001	G. mutabilis stock Skg-1 5-20 x 8 μm Koshigaya Saitama, 2001
G. mutabilis 7-12 x 7 μm Furuyakami Kawagoe Saitama, 2004	G. mutabilis ? 6-9 x 7-8 μm Musashi-Urawa Saitama, 2002	G. mutabilis ? stock Cak-2 7-16 x 7-8 μm Akebono-yama A.P. Kashiwa Chiba, 2002	G. mutabilis ? μm Uruguay, 1999

Similar genera -->> Microspora; Klebsormidium;

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