Description: Forming a bluish-white thallus of compacted soft granules in dry underhangs sheltered from direct rain, the thallus of this species tests KC+ red, Pd-. It occurs on acidic or slightly calcareous rocks below overhanging vegetation in woodlands. In Ireland, the species occurs in the Burren, County Clare and in Counties Mayo and Donegal.

Key Identification Features:

• Thallus C+ red, KC+ red, Pd-; soft, bluish-white to grey granular surface
• Sheltered from direct rain below low outcrops and cliffs in woodland.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Lepraria crassissima at iNaturalist World Species Observations database.