Description: This predominantly coastal lichen may have been incorrectly reported from Ireland. There are old records from Counties Dublin and Cork but both of these are unconfirmed. However, it would not be unexpected for it to turn up on coastal jetties or estuarine timbers. C. corrugatum differs from the common lichen C. griffithii in its thick, warty thallus — often with a greasy sheen, and creamy yellow discs.

Key Identification Features:

• Thallus pale grey, rather thick, warty, greasy-looking; black spots (pycnidia) numerous
• Discs rare, creamy yellow; coastal timbers.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Cliostomum corrugatum at iNaturalist World Species Observations database.