Description: Look for this species on rocky, siliceous seacliffs squeezed between other lichens. It forms small streaks of red-brown thallus which appears cracked (like shattered glass) into tiny areoles (<2mm diam.) The areoles are spotted with dark brown dots which are the discs. Coastal, scattered in Ireland, probably under-recorded.

Key Identification Features:

• Thallus red-brown, eye-catching, shattered into areoles like crazy paving
• Often forming small streaks; always on siliceous rock.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Acarospora impressula at iNaturalist World Species Observations database.