• Cladonia firma (Nyl.) Nyl.
Cladonia firma
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(Map updated: 11 August 2009)

This species is similar to C. foliacea (described elsewhere), but has a distinctive grey-violet hue to the lower surface of the squamules (0.41cm tall) and a K+ yellow thallus. The species grows on rather basic soils. It never grows with C. cervicornis, a lichen of acid soils, which also has a grey-violet underside, but different chemistry. In Ireland, it has been recorded from a few localities, for example, Counties Donegal and Londonderry.

Key characteristics

  • Thallus not unlike C. foliacea but with squamules grey-violet below. K+y
  • On neutral to basic soils often near the coast.

Original text submitted by

 Simms, M. J., (2016). Cladonia firma (Nyl.) Nyl.. [In] LichenIreland. Accessed on 2018-12-18.