Description: This rare acid rock lichen has a thick, granular, lemon-yellow thallus that thrives in very dry, shaded rock underhangs, such as can be found above upland streams and rivers. Despite its conspicuous colour it will take some searching in order to locate suitable habitat. County Wicklow appears to be its main headquarters in Ireland. Psilolechia lucida is pale and thin by comparison. Discs are unknown.

Key Identification Features:

• Thick lemon-yellow thallus of coarse granules
• On dry, acid rocks, crevices and underhangs, particularly in sheltered habitats such as under boulders above ravines.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Chrysothrix chlorina at iNaturalist World Species Observations database.