• Toninia thiopsora (Nyl.) H.Olivier
Toninia thiopsora
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(Map updated: 11 August 2009)

This crustose lichen grows on the vertical surfaces of exposed siliceous boulders, usually in windy sites in the mountains. It is always found growing on the surface of the leafy liverwort Gymnomitrion crenulatum which forms tight cushions that adhere like glue to the rock surface. T. thiospora has a small, scaly (squamulose) thallus comprising aggregations of rounded granules which are yellowy-green or yellow-tan in colour. The unfrosted discs are weakly convex. Very distinctive; western Ireland mainly.

Key characteristics

  • On exposed acid boulders in mountains, always among cushions of the liverwort Gymnomitrion
  • The thallus is scaly, the scales rolled into yellowy granules, which causes them to stand out against the background.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Toninia thiopsora (Nyl.) H.Olivier. [In] LichenIreland. Accessed on 2019-08-25.