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(Map updated: 11 August 2009)

This brown, foliose species occurs mostly on twigs and branches of well-lit trees and is characterised by its warty or pimpled surface and frequent discs with a similarly pimpled rim. The layer below the cortex is C-. The underside of the lobes is black. It occurs throughout Ireland but is possibly under-recorded.

Key characteristics

• The high frequency of discs and warts surrounding the fruits as well as on the shiny brown surface helps to confirm this species. It is also C-
• It is essentially a species of branches and twigs.

Original text submitted by Simon Davey