• Caloplaca concilians (Nyl.) H.Olivier
Caloplaca concilians
Click on map to open large map in new window
(Map updated: 11 August 2009)

Click here to view an interactive map of the Northern Ireland dataset as currently collated by CEDaR.
The map is generated through the NBN Gateway using their Interactive Mapping Tool.


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 2018-08-16.