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Name derivation:




Homoeothrix (Thuret ex Bornet and Flahault) Kirchner 1898; 25 of 40 species descriptions are currently accepted taxonomically (Guiry and Guiry 2013).

Order Oscillatoriales; FamilyAmmatoideaceae


Upright sessile tapered filaments with a thin sheath open at the apex. Cells usually eingeschnurt (incut at crosswalls), most shorter than wide, with terminal cell elongated and hair-like. Pale green, olive green or grayish. No akinetes, heterocysts, or gas vesicles (aerotopes). May occur as individual filaments, or form a mat.

Similar genera:




Most species are epiliths in mountain streams and tarns. One species is marine.


Guiry, M.D. and G.M. Guiry 2013. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 28 February 2013.