Description: This powder lichen is a characteristic feature of shady crevices in old walls, stone bridges and ruined buildings that have had their mortar courses weathered over time. The apple-green colour and fluffy, cottony texture of the thallus is diagnostic. It is widespread in Ireland.

Key Identification Features:

• The colour, texture and confinement to shaded calcareous habitats indicate this species
• Most weathered mortar courses on the shaded side of old walls should support it. It is usually one of the first ticks in a lichen beginner’s notebook.

Original text submitted by Simon Davey

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

iNaturalist: Botryolepraria lesdainii at iNaturalist World Species Observations database.