• Verrucaria caerulea DC.
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Verrucaria caerulea
© Mike Simms
Verrucaria caerulea
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(Map updated: 11 August 2009)

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 2019-08-25.