• Verrucaria caerulea DC.
Click on the image to enlarge it in a new window
Verrucaria caerulea
© Mike Simms
Verrucaria caerulea
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 is a crustose species characteristic of hard limestones, often in shady situations. It is easily told from other species by its finely cracked, blue-grey to silver-grey colour. The spherical discs (perithecia) are abundant and over three-quarters immersed in the thallus. It is common in areas with suitable habitat, especially on the limestones of western Ireland.

Key characteristics

  • The thick, finely cracked, silver-grey thallus, abundant discs and the habitat strongly suggest this species
  • The discs that are tiny flasks embedded in the thallus have a conspicuous concave depression at the top, which can be seen with a hand lens.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Verrucaria caerulea DC.. [In] LichenIreland. Accessed on 2018-07-22.