Lichen 2b (1)

Lichen 2b (1)

Observation - Lichen 2b (1) - UK and Ireland. Description: Grey, areolate crustose lichen growing on seat of wooden bench (images shown) and also 10m away on siliceous sandstone rocks. Dense warty appearance within thallus (isidia?) and very clear black band then white outer band at edge of prothallus. Possibly

Grey, areolate crustose lichen growing on seat of wooden bench (images shown) and also 10m away on siliceous sandstone rocks. Dense warty appearance within thallus (isidia?) and very clear black band then white outer band at edge of prothallus. Possibly Pertusaria coccodes.