Description: Formerly named Leproplaca chrysodeta, the powdery, K+ purple thallus of this lichen can develop into a thick, dull orange-mustard yellow, finely cracked crust. It occupies niches in dry, shaded limestone cliffs and sometimes man-made walls. Widely but thinly distributed in Ireland.

Key Identification Features:

• Patchy or continuous, powdery-cracked thallus; brownish to mustard yellow
• Shaded limestone and calcareous rocks, also overgrowing mosses and wall mortar.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Leproplaca chrysodeta at iNaturalist World Species Observations database.