Order: Pertusariales       Family: Pertusariaceae Pertusaria leioplaca Growth type crustose. Photos: Macroom, Co. Cork and Killarney, Co. Kerry, SW Ireland. Specimen left and immediately below confirmed by Brian Coppins Thin grey-white to pale greenish-grey thallus containing clusters of coarse crystals. Margin +/- unzoned. Scattered flat-topped warts with spreading, +/- elliptical bases. Apothecia usually single with small pore-like discs. Pycnidia are rare. Asci 3-(4)-6 spored. Occurs throughout Ireland on sheltered, shaded, smooth-barked deciduous trees and shrubs. K+ yellow, C-, KC+ yellow, P+/- orange-red, UV+/- pale orange Similar: Pertusaria pertusa, 2-spored asci

Pertusaria leioplaca November 2009 and February 2010