Family: Trichome (filamentous structure) lacks heterocysts; with equal diameter throughout whole length; no hair-like structure; no branching.
Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells (Illustrations of The Japanese Fresh-water Algae, 1977).

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I) Trichome not constricted at cell-cell junctions; not tapering toward ends
Trichome more than 10 μm in diam.; L/W less than 1.0
O. princeps v. princeps 10 samples 13-47 μm φ L/W=0.11-0.21 1999-2006	O. princeps v. minor 10 samples 13-47 μm φ L/W=0.11-0.21 1999-2006	O. limosa 22 samples 13.5-19 μm φ L/W=0.15-0.4 199?-2006	O. curviceps 11 samples 10.5-13 μm φ L/W=0.13-0.5 2003-2006
Oscillatoria sp. ? 4.5-9.0 x 11 μm L/W=0.4-0.8 Komado marsh Showa & Tajima Fukushima, 2004	Oscillatoria sp. ? 4-8 x 11 μm L/W=0.4-0.7 Obihiro-Hasshonochi Obihiro Hokkaido, 2005	Oscillatoria sp. ? 2 samples 2.5 x 11,12 μm Japan, 2005
Trichome between 5-10 μm in diam. L/W less than 1.0
O. subspiroides ? 1-2.5 x 10 μm L/W=0.1-0.3 rice field Ichinoseki Iwate, 2005	O. irrigua ? 17 samples 5-11 μm φ L/W=0.4-0.9 2003-2006	O. simplicissima ? 20 samples 7-11 μm φ L/W=0.3-0.65 2002-2008
O. nigra ? 5-10 x 10 μm φ L/W=0.5-1.0 Toyonodai park Otone Saitama, 2006	O. nigra ? 4-8 x 6-8.5 μm φ L/W=0.5-0.9 Maeda Furukawa Miyagi, 2003	O. nigra ? 4-8 x 7.5 μm φ L/W=0.5-1.1 Obihiro-Hasshonochi Obihiro Hokkaido, 2005	O. nigra ? 4-6 x 7 μm φ L/W=0.4-0.9 Watarase river Ashikaga Tochigi, 2004
O. yufuensis ? 2-3 x 8 μm φ L/W=0.3-0.4 Tanohara Natural p. Ontake highland Nagano, 2005	O. yufuensis ? 2-4 x 9 μm φ L/W=0.2-0.4 Nidanuma Tsuchiyu-onsen Fukushima, 2005	O. agardhii 19 samples 4.5-6.5 μm φ L/W=0.3-1.0 2003-2006	O. agardhii ? 3 samples 4.5-5 μm φ L/W=0.5-1.0 2003-2004
O. mougeotii 2.5 x 6 μm L/W=0.4 Toguchi Sakado Saitama, 2004	O. subbrevis 1.4 x 5 μm L/W=0.28 Kinchakuda Hidaka Saitama, 2004	Oscillatoria sp. or Lyngbya ? 1.7 x 9.5 μm L/W=0.18 Riverside green l. Sawara Chiba, 2004	Oscillatoria sp. or Lyngbya ? 7 μm φ L/W= Kozuki Pond Takamatsu Kagawa, 2002
Oscillatoria sp. or Lyngbya ? 6.5 μm φ L/W= Namegawa Saitama, 2003
Trichome between 5-10 μm in diam. L/W more than 1.0
Oscillatoria sp. 10 x 7 μm φ L/W=1.4 Yoshigadaira m. Shirane mountain Gunma, 2005	Oscillatoria sp. 10 x 7 μm φ L/W=1.4 Hanasaki water p. Kazo Saitama, 2005
Oscillatoria sp. 9-13 x 5 μm L/W=1.8-2.6 Imou bog Toyohashi Aichi, 2004	Oscillatoria sp. 10 x 5 μm L/W=2.0 Ukishima marsh Tsugaike highland Nagano, 2005	Oscillatoria sp. or Phormidium ? 3-7 x 5 μm L/W=0.6-1.4 Shimizu-daira Nasu Tochigi, 2005
Oscillatoria sp. 5-10 x 6 μm L/W=0.8-1.8 Shiba river near Owada Park Saitama, 2005	Oscillatoria sp. 6 x 6 μm L/W=1.0 Mihashi Park Saitama Saitama, 2005	Oscillatoria sp. 2.5-5 x 4.5 μm L/W=1.1 Mihashi Park Saitama Saitama, 2005
Trichome less than 5 μm in diam.
Oscillatoria sp.6 3 samples 3.8-4 μm φ L/W= 199?-2001	O. chlorina ? 3 samples x 3-4 μm L/W= 2004-2005	Oscillatoria sp.7 2 samples 3-3.5 μm φ L/W= 199?-2001	O. jasorvensis ? 5 x 3.5 μm L/W=1.4 Yoshigadaira m. Shirane mountain Gunma, 2005
Oscillatoria sp. x 4.5 μm φ L/W= Tanohara marsh Shiga highland Nagano, 2005	Oscillatoria sp. x 4 μm φ L/W= Mihashi Park Saitama Saitama, 2005	Oscillatoria ?? 3.5 μm φ L/W= Japan, 199?
O. lemmermannii 7 samples 2-3 μm φ L/W=1.2-3.5 2003-2005	O. planctonica ? 5 samples 2 x 1.5-2 μm φ L/W=1.0-1.5 2003-2004
O. subtilissima 12 samples 1.5-3 μm φ L/W=1.0-2.3 2002-2005	O. quasiperforata 14 samples x 1-2.5 μm L/W= 199?-2006	Oscillatoria sp. ? 2-4 x 1 μm φ L/W=2-4 Ikenokochi marsh Tsuruga Fukui, 2004	Oscilatoria sp. ? x 1 μm φ Kamisuwa r.w.st. Suwa Nagano, 2005
II) Trichome not constricted at cell-cell junctions; tapering toward ends
Trichome more than 5 μm in diam.
Oscillatoria sp. 2-3 x 10 μm φ L/W=0.2-0.3 Toguchi Sakado Saitama, 2004	Oscillatoria sp. 3-6 x 9 μm φ L/W=0.3-0.7 Tanohara Natural p. Ontake highland Nagano, 2005	Oscillatoria sp. 3 x 9 μm φ L/W=0.3 Mizuko Fujimi Saitama, 2003	Oscillatoria sp. 7-8 μm φ L/W= Maeda Furukawa Miyagi, 2003
O. brevis ? 9 samples 5.5-7.5 μm φ L/W=0.3-0.8 2002-2006	O. brevis ? 2-4 x 7 μm φ L/W= Ichono-kawa Higashi-Matsuyama Saitama, 2006	Oscillatoria sp. 1-2 x 7 μm φ L/W= Oyama general p. Oyama Tochigi, 2006
O. priestleyi ? 3 samples 6-7 μm φ L/W=0.3-1.0 2001-2005	O. amoena ? 5.5 μm φ L/W=0.55-1.1 Kodai-hasu Gyoda Saitama, 2006
Trichome less than 5 μm in diam.
O. uncinata ? 3 samples x 3-4 μm L/W=1.7 Japan, 2005	Oscillatoria sp.8 or Lyngbya ? 2 samples 2.5 μm φ L/W= 2001-2003	O. splendida 4 samples 3-8 x 2.5-3 μm L/W=1.2-2.7 2004-2006	O. acutissima 2 samples x 1.2-2 μm L/W=2.5-5.4 Japan, 2004
III) Trichome constricted at cell-cell junctions; not tapering toward ends
Trichome more than 5 μm in diam.
O. tenuis 9 samples x 4-12 μm L/W=0.2-1.1 199?-2007	O. tenuis 9 samples x 4-12 μm L/W=0.2-1.1 199?-2007	Oscillatoria or Phormidium retzii ? 6-8 x 8.5 μm water treatment c. Sakado Saitama, 2004	Oscillatoria sp. 6.5 μm φ L/W= Japan, 199?
Oscillatoria sp. or Phormidium retzii ? 6-11 x 7.5 μm L/W=0.8-1.5 Shin-Akitsu Higashi-Murayama Tokyo, 2004	Oscillatoria sp. or Phormidium retzii ? 5-10 x 7.5 μm L/W=0.67-1.33 Gyodashi-sogo p. Gyoda Saitama, 2006	O. iwanoffiana ? 6 samples x 5-7 μm φ L/W=0.5-1.2 2003-2005	Oscillatoria sp. or Anabaenopsis ? 5-10 x 6 μm L/W=0.8-1.7 Watasuge marsh Tsugaike highland Nagano, 2005
O. hamelii 5 μm φ L/W=0.7-1.4 Kejo-numa Furukawa Miyagi, 2003
Trichome less than 5 μm in diam.
O. jovis 3 samples 3-7 x 3-5 μm L/W=0.7-1.4 2002-2007	O. spirulinoides ? 2.2 x 3.5 μm L/W=0.6 Todoroki g.l. Kawasaki Saitama, 2004	Oscillatoria sp. ? 2-4 x 3 μm L/W=0.7-1.3 Kurome river Asaka Saitama, 2004	O. geminata ? 3-5 x 3 μm L/W= Hasu-ike Shiga highland Nagano, 2005
O. geminata ? 4.5-8 x 2.5 μm L/W=2-3.2 Sukawa highland Kurikoma mountain Akita, 2005	Oscillatoria sp. ? or Planktothrix ? 4-8 x 2.5 μm kenko-fukushi m. p. Koshigaya Saitama, 2005	O. limnetica ? 2 samples 1.5 μm φ L/W=1.3-2.7 Japan, 2002	O. neglecta ? 0.5-1.0 x 1.2 μm φ L/W=0.4-0.8 Japan, 199?
IV) Trichome constricted at cell-cell junctions; tapering toward ends
Oscillatoria sp. ? 3-4 x 7-10 μm L/W= Watasuge marsh Tsugaike highland Nagano, 2005	O. formosa 8.5-9.5 μm φ L/W= Naruto Chiba, 2003	O. okeni 4-7 x 6.5 μm L/W=0.6-1.1 Tsukamoto Sakura-ku Saitama, 2004	Oscillatoria sp. or Phormidium ? 6-12 x 7 μm L/W=0.8-1.8 Teganuma Biotope Abiko Chiba, 2008
Oscillatoria sp. 4-8 x 6 μm L/W=0.7-1.3 Ukishima marsh Tsugaike highland Nagano, 2005
Trichome less than 5 μm in diam.
O. cortiana 4.5 μm φ L/W=1.0-1.6 Tsukamoto Sakura-ku Saitama, 2004	O. cortiana 4 μm φ Shirahata-Numa Urawa Saitama, 2005

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