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; filments solitary or agglutinate within a gelatinous matrix (Illustrations of The Japanese Fresh-water Algae, 1977).

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Filaments solitary or form a thin gelatinous sheath
Anabaena sp. ? x 13 μm Omine-numa Tsukiyono Gunma, 2003	Anabaena sp. ? x 12 μm Shikinawa-ike Fukuoka, 2001	Anabaena sp. ? x 12 μm Numappara marsh Kuroiso Tochigi, 2003	Anabaena sp. ? x 11 μm O-ike park Yabuki Fukushima, 2003
Anabaena sp. 5-8 x 9 μm Tsukamoto Sakura-ku Saitama, 2004	Anabaena sp. x 6-8 μm Mizumoto park Tokyo, 2001	Anabaena sp. 2.5-5 x 7 μm near Town Hall Shobu Saitama, 2004	Anabaena sp. x 7-8 μm Mizumoto Park Tokyo, 2001
Anabaena sp. x 8 μm Ishinazaka Furukawa Miyagi, 2003	Anabaena sp. 4-8 x 8 μm Mitsumata-numa Kawagoe etc. Saitama, 2005	Anabaena sp. x 7-8 μm Saitama, 1999	Anabaena sp. 4-8 x 7-8 μm near Akai wetland Aizuwakamatsu Fukushima, 2005
Anabaena sp. 3-9 x 8 μm Onnenai Kushiro marsh Hokkaido, 2005	Anabaena sp. ? 4 x 6 μm Watarase Wetland Fujioka Tochigi, 2005
Anabaena sp. 3-6 x 6.5 μm Kurome river Asaka Saitama, 2004	Anabaena sp. x 6 μm near Imou marsh Toyohashi Aichi, 2004	Anabaena sp. 3-6 x 6 μm Onnenai Kushiro marsh Hokkaido, 2005	A. torulosa ? x 5-6 μm Shimo-yanagi Showa Saitama, 2003
A. torulosa ? 2.5-4 x 5.5 μm Konuma Sakado Saitama, 2004	Anabaena sp. ? x 6 μm Ishinazaka Furukawa Miyagi, 2003	Anabaena sp. ? x 5.5 μm Kozuki Pond Takamatsu Kagawa, 2002	Anabaena sp. ? x 4.5 μm Kurihashi Saitama, 2001
Anabaena sp. x 4.5 μm Saitama, 1999	Anabaena sp. 4.5 μm Kitayama park Higashi-Murayama Tokyo, 2004	Anabaena sp. 4.5 μm Higashi-sano Hakuba Nagano, 2004	Anabaena sp. 5-8 x 4.5 μm Mitsumata-numa Kawagoe etc. Saitama, 2005
A. cylindrica ? x 4 μm Omine-numa Tsukiyono Gunma, 2003	A. cylindrica ? x 4 μm near Imou marsh Toyohashi Aichi, 2004	Anabaena sp. x 3-4 μm near Shide-numa Kita-kawabe Saitama, 2005
A. spiroides 6 samples x 4.5-10 μm 1999-2004	A. oscillarioides 6-8 μm Yanase river Fujimi Saitama, 2003	Anabaena sp. 2-4 x 6 μm Kurome river Asaka Saitama, 2004	Anabaena sp. ? or Anabaenopsis ? x 3-6 μm Kuroiso Tochigi, 2001
A. iyengari ? 2-4 x 4 μm Kinchakuda Hidaka Saitama, 2004	A. iyengari ? 3-5.5 x 4.5 μm Lake Nojiri Shinano Saitama, 2004	Anabaena sp. ? x 3 μm Shinobazu-ike Ueno Tokyo, 2001	Anabaena sp. ? 2.5-4.5 x 3 μm Senuki Nasu Tochigi, 2004
A. flos-aquae ? x 2.5 μm Takezono-higashi p. Tsukuba Ibaraki, 2003	Anabaena sp. ? or Oscillatoria ? x 5 μm Senjo-ga-hara Nikko Tochigi, 2003	Anabaena sp. ? x 6 μm Japan, 199?	Anabaena sp. ? 3-6 x 3 μm Numa-no-hara m. Madarao highland Niigata, 2005
Anabaena sp. ? 2-4 x 3 μm Sukawa highland Kurikoma mountain Akita, 2005	Anabaena sp. ? 5-7 x 7 μm Iroha-numa Zao mountain Yamagata, 2006

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