Description: This striking yellow-green lichen is a common sight on shaded siliceous rocks, for example, sandstones, and the shaded brickwork of old buildings. It is relatively insensitive to industrial pollution. It consists of a powdery crust often spreading extensively over the substrate. It is occasionally fertile, with rather pale, small, yellowish-beige discs. Under a UV lamp it is dull to bright orange which helps to separate it from some similarly coloured sterile species.

Key Identification Features:

• The yellow-green, powdery thallus is distinctive, especially when growing on headstones in local churchyards and cemeteries
• Dry, shady situations are ideal conditions for it.

Original text submitted by Simon Davey

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

iNaturalist: Psilolechia lucida at iNaturalist World Species Observations database.