• Pertusaria multipuncta (Turner) Nyl.
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Pertusaria multipuncta
© Robert Thompson
Pertusaria multipuncta
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(Map updated: 11 August 2009)

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This grey, crustose epiphyte of smooth, acid-barked trees and shrubs, such as hazel, holly and beech, is known by its sorediate crater-like warts that conceal the discs below; each sprinkled with a fine veil of powder and crystals. It tends to occur in wooded areas that have remained long undisturbed. It is scattered in suitable habitats in Ireland.

Key characteristics

  • The grey thallus is cracked like a layer of reptile skin and is darker than the warts which appear on the surface
  • The crater-like warts are edged with white granules (soredia) and conceal the discs. Rubbing the soralia with a thumb will reveal them beneath. It has a passing resemblance to Phlyctis agelaea from which it is distinguished by the K+ red reaction.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Pertusaria multipuncta (Turner) Nyl.. [In] LichenIreland. Accessed on 2018-07-16.