• Lecanora helicopis (Wahlenb.) Ach.
Lecanora helicopis
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This is a common, shaded sea-cliff species of siliceous rocks in the zone just above high-water mark. It has small black discs dispersed on a cracked, grey thallus. Search for it between the bright thalli of other more exuberant and colourful crusts. It is common in suitable maritime habitats throughout Ireland.

Key characteristics

  • The slate to lead-grey thallus and tiny, black discs should distinguish it
  • It should never be confused with Lecanora actophila, a species of similar habitats with a yellow-green thallus.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Lecanora helicopis (Wahlenb.) Ach.. [In] LichenIreland. Accessed on 2018-08-16.