Description: With a small, scaly thallus of thick, grey to tan-brown, rounded or angular overlapping squamules (0.5-4mm diam.) bearing white-edged margins and large discs (about the same size as the squamules) which are completely covered in a veil of grey pruina, and growing on hard calcareous rocks – this will be Acarospora glaucocarpa. It is often the sugared discs which first attract the attention. The thallus is C-. It is rare and local in the south-east of Ireland.

Key Identification Features:

• Thallus tan-brown of scattered squamules with frosted edges
• Discs to 2mm diam., frosted over with a thick, grey pruina; on hard limestone.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Acarospora glaucocarpa at iNaturalist World Species Observations database.