Lichen on a rendered wall

Lichen on a rendered wall

Observation - Lichen on a rendered wall - UK and Ireland. Description: Crustose lichen having a greenish-grey thallus with a white margin. Lots of red-brown apothecia crowded in the centre. C-, K+, growing on a rendered wall.

Crustose lichen having a greenish-grey thallus with a white margin. Lots of red-brown apothecia crowded in the centre. C-, K+, growing on a rendered wall.