Order: Lecanorales       Family: Physciaceae Species: Physcia clementei Growth type foliose. Photos: On rock, Ballyrisode, Cork Ireland Closely adpressed pale-grey or whitish thallus with narrow, overlapping lobes. White undersurface with pale rhizines. Centre of thallus densely covered with short, granular isidia that can break down and become coarsely sorediate. Infrequently fertilein Ireland and Britain, pruinose black apothecia with crenulate margins. Rare, on nutrient-rich trees and +/- vertical rocks and walls. Medulla and cortex: K+ yellow

Physcia clementei. February 2009, May 2010