Description: This crustose lichen has a conspicuous zoned margin and thick, rough, greenish-grey thallus. The fruiting discs are hidden in pea-shaped, lumpy warts (several per wart) dotted with little openings the size of a pinprick. It is common on tree bark but is also occasionally found on rock.

Key Identification Features:

• Greenish-grey with a zoned edge
• The pea-shaped warts are dotted with holes (disc openings) as if pricked with a pin.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Pertusaria pertusa at iNaturalist World Species Observations database.