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(Map updated: 11 August 2009)

This is the commonest of the three Irish representatives of this mainly tropical genus. In T. lepadinum the raised discs resemble barnacle-like warts scattered over a shiny, pale, grey-cream crust. It can be found mostly on the smooth bark of trees where there is a history of continuous canopy cover, but can also spread to rock.

Key characteristics

• Shiny, wrinkled, grey-cream crust
• The discs are pustules, barnacle-like in appearance, with pore-like openings.

Original text submitted by Vince J. Giavarini