Immersed, pale grey to whitish thallus with black apothecia, variable in shape but usually irregularly stellate. Found on nutrient rich smooth bark and twigs, often on Ash (Fraxinus excelsior)

Determiner: 
Christine Johnson

References: 
Smith et al. editors (2009) The Lichens of Great Britain and Ireland
Dobson (2018) Lichens: an Illustrated Guide to the British and Irish Species