Dirina lichen?

Dirina lichen?

Observation - Dirina lichen? - UK and Ireland. Description: Crustose lichen found on west-facing vertical surface of a gravestone. White thallus with rather lobed looking margin, powdery surface and very heaped up in some areas. No fruits seen.

Crustose lichen found on west-facing vertical surface of a gravestone. White thallus with rather lobed looking margin, powdery surface and very heaped up in some areas. No fruits seen.