• Aspicilia caesiocinerea (Nyl. ex Malbr.) Arnold
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Aspicilia caesiocinerea
© Mike Simms
Aspicilia caesiocinerea
© Mike Simms
Aspicilia caesiocinerea
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(Map updated: 11 August 2009)

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This large, spreading, crustose species of nutrient-rich rocks and walls occurs widely throughout Ireland: near the sea, alongside lough margins and more especially, on river boulders. The grey thallus with a roughened, warted surface looks rather like a scruffy or crumpled version of A. calcarea (described elsewhere) which is much smoother and of an ‘ironed’ appearance and never breaks up into island pieces (areoles) of thallus.

Key characteristics

  • The darker, more congested, cracked thallus with black discs having an irregular margin helps suggest this species
  • Unlike Aspicilia cinerea which is Pd+ orange and K+ red, it is both K- and Pd-.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Aspicilia caesiocinerea (Nyl. ex Malbr.) Arnold. [In] LichenIreland. Accessed on 2018-08-14.