Family: Trichome (filamentous structure) with heterocysts; with equal diameter throughout hole length; no branching; heterocysts intervening or at base.
Genus: Mucous sheath, nearly invisible; heterocysts intervening; filaments agglutinate (Illustrations of The Japanese Fresh-water Algae, 1977).

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Filaments form agglutinates of constant shape
Nostoc sp. μm Saitama, 1999	Nostoc sp. μm Mihashi Park Saitama, 2002	Nostoc sp. μm Hasuda Saitama, 2002	Nostoc sp. μm Riverside green l. Sawara Chiba, 2004
Nostoc sp. 3-6 x 5.5 μm Higashi-sano Hakuba Nagano, 2004	Nostoc sp. 3.0-5.5 x 3.5-4.0 μm near Yamaguchi Univ. Yamaguchi, 2004	Nostoc sp. 4-5 x 4.5 μm Furuike marsh Togakushi highland Nagano, 2005	Nostoc sp. μm Dojo-ike Norikura highland Nagano, 2006
Nostoc sp. μm Japan, 1998	Nostoc sp. μm near Lake Aoki Omachi Nagano, 2006
Nostoc sp. μm Maihara Shiga, 2003	Nostoc sp. or Anabaena ? μm Japan, 1998	Nostoc sp. 9-10 μm Aquatic botanical g. Sawara Chiba, 2004	Nostoc sp. or Anabaena ? μm Japan, 2000
Nostoc sp. or Anabaena ? μm Shiga, 2000	Nostoc sp. ? or Anabaena ? μm 2000	Nostoc sp. ? or Anabaena ? μm Ishinazaka Furukawa Miyagi, 2003	N. paludosum ? or Anabaena ? x 4 μm Tsukamoto Sakura-ku Saitama, 2004
Nostoc sp. ? μm Tsukamoto Sakura-ku Saitama, 2004	Nostoc sp. ? μm near Town Hall Shobu town Saitama, 2004	Nostoc sp. ? 3-5 x 3 μm Univ. A.V.M. Obihiro Hokkaido, 2005

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