• Caloplaca concilians (Nyl.) H.Olivier
Caloplaca concilians
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(Map updated: 11 August 2009)

This very rare black-fruited Caloplaca colonises siliceous rock and is the only of its kind to do so in Ireland; it could be easily overlooked for a small species of Buellia or Lecidea. The very dark, cracked thallus has convex discs which, though black when dry, turn dark rust-red if wetted. In Ireland, most old records originate from the north-east coast. It occurs on base-rich schistose rocks.

Key characteristics

  • Thallus almost black; discs convex, black, but becoming dark rust red when wet
  • Very like a species of Lecidea; basic, schistose rocks mainly.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Caloplaca concilians (Nyl.) H.Olivier. [In] LichenIreland. Accessed on 2019-08-18.