Family: Trichome (filamentous structure) lacks heterocysts; with equal diameter throughout whole length; no hair-like structure; no branching.

Trichome naked, without a sheath
Oscillatoria 1-49 μm diam. 1999-2006	Oscillatoria 1-49 μm diam. 1999-2006	Oscillatoria 1-49 μm diam. 1999-2006	Oscillatoria 1-49 μm diam. 1999-2006
Trichome within a sheath
Lyngbya Japan, 199?-2003	Lyngbya Japan, 199?-2003	Lyngbya Japan, 199?-2003	Lyngbya or Phormidium ? Japan, 199?-2003
Phormidium 8 samples x 4.5-12 μm 199?-2005	Phormidium 8 samples x 4.5-12 μm 199?-2005
Many trichomes within a sheath
M. steenstruppi 4.5 μm diam. tapered end Japan, 1998	Microcoleus sp. μm diam. Iruma River side Tsurugashima Saitama, 2003	Microcoleus sp. 4 μm diam. blunt end Tokyo, 2001	Schizothrix sp. ? 1.5 μm diam. Wakamiya Park Matto Ishikawa, 2002
Trichome spiral
Spirulina sp. Ushijima park Kasukabe Saitama, 2003	Spirulina sp. Shimo-yanagi Showa Saitama, 2003	Spirulina sp. Kozutusmi Kawagoe Saitama, 2004
S. major ? Ukima Park Tokyo, 2001	S. laxa ? x 2 μm river bank Doman-green Park Saitama, 2003	S. labyrinthiformis in preparation 2003

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