Description: 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 Identification Features:

• 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.

Original text submitted by Vince J. Giavarini

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

iNaturalist: Lecanora praepostera at iNaturalist World Species Observations database.