Description: This brown, purple-tinted, crustose lichen with scattered, black discs (to 0.6mm) is an acid rock specialist often dominating rock surfaces in upland areas together with F. cyathoides (described elsewhere) and the ‘map lichen’ Rhizocarpon geographicum. Chemical reactions are negative. Northern and western Ireland.

Key Identification Features:

• Thallus brownish-purple with scattered, black, almost margin-free discs
• An upland species of hard, acid rocks.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Fuscidea lygaea at iNaturalist World Species Observations database.