Species: Physcia clementei
Photos: On coastal rock near Ballyrisode bridge. Cork, SW 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 fertile, 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 and May 2010