• Cecidonia xenophana (Körb.) Triebel & Rambold
Cecidonia xenophana
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 lichenicolous species is easily told from its host Porpidia spp., and principally P. contraponenda. The whitish thallus supports abundant black discs (0.2-0.3mm diam.), some, but not all, with a central umbo. All spot test reactions are negative. In Ireland, the species is local; County Mayo northwards.

Key characteristics

  • Whitish thallus developed on Porpidia species in upland areas
  • Discs small, black, some with a central umbo; spot tests negative.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Cecidonia xenophana (Körb.) Triebel & Rambold. [In] LichenIreland. Accessed on 2018-08-17.