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(Map updated: 11 August 2009)

This crustose lichen has a white to pale grey thallus with neat, convex, marginal lobes. It can become covered in soredia a shade darker than the thallus. It is a familiar rosette-forming species in sheltered habitats exposed to nutrient-rich dust. Older specimens often lose their centres, especially on steep, vertical walls and on churchyard headstones. Black discs occur, but are usually uncommon. Frequent on nutrient-rich trees, old buildings and monuments.

Key characteristics

• Uniformly robust and pale grey throughout
• Soredia frequent; old crusts can loose their centres.

NBN Atlas mapping: Species account : NBN Atlas UK Species Observations database

iNaturalist: Species account : iNaturalist World Species Observations database

Original text submitted by Vince J. Giavarini