Yellow lichen on granite

Yellow lichen on granite

Observation - Yellow lichen on granite . Description: Yellow, areolate lichen with black prothallus growing on granite gravestone. Black immersed apothecia. Thalli in pictures on same gravestone showing jigsaw boundaries with dull, grey (B. aethalea?) lichen. Possibly Buellia ocellata.

Yellow, areolate lichen with black prothallus growing on granite gravestone. Black immersed apothecia. Thalli in pictures on same gravestone showing jigsaw boundaries with dull, grey (B. aethalea?) lichen. Possibly Buellia ocellata.