Description: Well distributed throughout Ireland, this common, crustose lichen occurs mostly on twigs, branches and fence timbers. It has crowded, rather swollen, yellow-green discs on a grey-green thallus that become distorted by the proximity of their neighbours. Frequently, the crowded discs become convex so losing their margins entirely and sometimes obscure the granular thallus. The disc edges are never powdery (sorediate). It grows always on acid-barked trees.

Key Identification Features:

• The creamy-green discs spreading to exclude their margins and non-powdery edges distinguish it
• Lecanora confusa has smaller discs and a distinctive, permanent, pale thalline margin.

Original text submitted by Simon Davey

Distribution Map from NBN: Lecanora symmicta at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Lecanora symmicta at iNaturalist World Species Observations database.