• Lecanora actophila Wedd.
Lecanora actophila
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This very abundant and scattered crustose, maritime lichen has a yellowish-grey thallus and small (<1mm diam.), dark brown discs. It is characteristic of the ‘grey’ lichen zone of acid sea-cliff rocks that lies just above the orange zone above the high-water mark. It is present in all suitable habitats around Ireland.

Key characteristics

  • The yellowish thallus and small, dark brown fruits, often with a distorted paler margin on maritime rocks suggest this species
  • The similar-sized sea-cliff lichen Lecanora helicopis has dark brown discs and a grey thallus so should not cause confusion.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Lecanora actophila Wedd.. [In] LichenIreland. Accessed on 2018-08-20.