(Aspicilia radiosa)

(Aspicilia radiosa)

Observation - (Aspicilia radiosa). Description: A thin crustose lichen on concrete. Irregular black apothecia with grey edges. Overlapping colonies with grey edges, roughly circular and about 3cm in diameter. Edit: Changed to match AlanS's ID. Many thanks.

A thin crustose lichen on concrete. Irregular black apothecia with grey edges. Overlapping colonies with grey edges, roughly circular and about 3cm in diameter.
Edit: Changed to match AlanS's ID. Many thanks.