Family: Trichome (filamentous structure) lacks heterocysts; with equal diameter throughout whole length; no hair-like structure; no branching.
Genus: A single trichome within a rigid sheath; sheath clear or yellowish; filaments planktonic or agglutinated (Illustrations of The Japanese Fresh-water Algae, 1977).

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L. confervoides trichome straight 19 μm diam. Japan, 199?	L. confervoides or Oscillatoria ? trichome straight 19 μm diam. Saitama, 2000	Lyngbya sp. trichome straight 6 μm diam. Japan, 1999	Lyngbya sp. ? trichome straight 2 μm diam. Japan, 199?
Lyngbya sp. ? trichome straight 1.5 μm diam. Japan, 199?	Lyngbya sp. 6 μm diam. Japan, 1999	Lyngbya sp. ? or Phormidium ? trichome wavy 3 μm diam. Kashiwa Chiba, 2002	Lyngbya sp. ? μm diam. Maeda Furukawa Miyagi, 2003
L. putealis v. minor ? μm diam. Kejo-numa Furukawa Miyagi, 2003

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