Fungi Outer Hebrides

Family: Verrucariaceae

Verrucaria muralis Ach.

Type: Crustose

Thin, pale, often greenish thallus with black perithecia. More frequent on base-rich substrate but occasionally found on siliceous rock where the thallus is generally thinner

Smith, C.W. et al. editors (2009) The Lichens of Great Britain and Irelandd
Dobson, F.S. (2018) Lichens: an Illustrated Guide to the British and Irish Species