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(Map updated: 11 August 2009)

The extensively cracked, green-yellow thallus of this maritime lichen occupies some of the most south-westerly coastline in Ireland. It is a species of vertical, siliceous sea cliffs and can be told by its wavy, tan to black or piebald, closely grouped discs and K+ yellow-blood red, Pd+ orange-red spot tests. In Ireland, the species is known from Counties Cork and Kerry.

Key characteristics

• K+ yellow to blood-red thallus, cracked, creamy-green, with a zoned edge; discs wavy, brown to black or piebald
• With lichens such as Buellia subdisciformis on exposed south-west coasts.

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