Family: Trichome (filamentous structure) with heterocysts; with equal diameter throughout hole length; no branching; heterocysts intervening or at base.

Filaments form agglutinates of constant shape
Nostoc 20 samples μm 1999-2006	Nostoc 20 samples μm 1999-2006	Nostoc 20 samples μm 1999-2006	Nostoc 20 samples μm 1999-2006
Filaments solitary or within a thin gelatinous matrix
Anabaena 39 samples μm 1999-2006	Anabaena 39 samples μm 1999-2006	Anabaena 39 samples μm 1999-2006	Anabaena 39 samples μm 1999-2006
Heterocysts present at terminal; adjascent cells become a large akinete
Cylindrospermum μm Koaze river Kawagoe Saitama, 2002	Cylindrospermum 3.5-7.0 x 4 μm Senuki Takaku-kou Tochigi, 2004	Cylindrospermum μm Dojo-ike Norikura highland Nagano, 2007	Cylindrospermum ? μm Japan, 1998
Cylindrospermum ? 4.5 x 4.5 μm Higashi-sano Hakuba Nagano, 2004	Cylindrospermum ? 5.5 x 4 μm near Yamaguchi Univ. Yamaguchi, 2004	Cylindrospermum ? 7.5-11 x 12 μm Onnenai Kushiro marsh Hokkaido, 2005	Cylindrospermum ? μm Kannon-numa 10 Shimogo Fukushima, 2008
Heterocysts present at terminal; adjascent cells never form a large akinete
Anabaenopsis 12 samples x 3.5-4.5 μm 2003-2005	Anabaenopsis 12 samples x 3.5-4.5 μm 2003-2005	Anabaenopsis 12 samples x 3.5-4.5 μm 2003-2005	Anabaenopsis 12 samples x 3.5-4.5 μm 2003-2005
Cell body always shorter than its width
Nodularia N. spumigena ? 3-6 x 9 μm Iroha-numa Zao mountain Yamagata, 2005	Nodularia N. spumigena ? 2.5-5 x 9 μm Karakemi marsh Yasaka Nagano, 2005	Nodularia N. spumigena ? 3-5 x 10 μm Shimizu-daira Nasu Tochigi, 2005
Nodularia sp. 6-8 x 20 μm Aquatic botanical g. Sawara Chiba, 2004	Nodularia sp. 4-12 x 22 μm Toneri Park Adachi-ku Tokyo, 2005

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