Description: This small, crustose lichen is a common species of upland, nutrient-enriched siliceous rocks and is characterised by its brown to pale pink discs. The thallus is formed from aggregations of shiny white or button-like squamules which gather into clumps that react C + red.

Key Identification Features:

• The C+ red reaction immediately suggest a member of the genus Trapelia
• T. coarctata which is similar is usually a continuous crust, never forming clumps.

Original text submitted by Simon Davey

Distribution Map from NBN: Trapelia glebulosa s. str. at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Trapelia glebulosa s. str. at iNaturalist World Species Observations database.