Description: This lichen is most common in urban areas on the grit-tiles of nutrient-enriched roofs of bungalow-style houses and the like and on other man-made substrata, such as concrete, asbestos-cement, asphalt and walls. The yellow-green to green-grey thallus can be rosette-like when young, but more often forms coalescing crusts with lobed margins tightly packed with pale brown discs with wavy edges. It is an attractive species in its own right especially when growing singly. It is widely distributed and expected to spread.

Key Identification Features:

• There are very few lichens like it. The tightly adpressed thallus, yellow-green colour, rosette-like form, overlapping lobes and pale brown convex discs should be sufficient
• Man-made habitats such as roof tiles (not slates) and concrete particularly attract it.

Original text submitted by Simon Davey

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

iNaturalist: Protoparmeliopsis muralis at iNaturalist World Species Observations database.