Fungi Outer Hebrides

Family: Xanthopyreniaceae

Collemopsidium foveolatum (A.L. Sm.) F. Mohr

Type: Crustose

Widespread and commonly found on the shells of barnacles, limpets and mussels. Immersed thallus with very small, black perithecia (fruiting bodies) that are immersed in pits.

Chris Johnson

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