Description: 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 Identification Features:

• 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

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

iNaturalist: Myriolecis actophila at iNaturalist World Species Observations database.