Lichen with piebald apothecia

Lichen with piebald apothecia

Observation - Lichen with piebald apothecia - UK and Ireland. Description: White areolate thallus growing on western limestone wall of church. Lecanorine apothecia with dark-brown discs. Some discs seem to be missing from the white ‘cups’ and some discs are only partly dark-brown with other part white. (Lecanora campestris seen

White areolate thallus growing on western limestone wall of church. Lecanorine apothecia with dark-brown discs. Some discs seem to be missing from the white ‘cups’ and some discs are only partly dark-brown with other part white. (Lecanora campestris seen nearby with complete dark brown discs.) Possibly Lecanora campestris (but wonder if this is a common form of apothecia with L. campestris or a diseased form or not L. campestris at all.)