Species: Parmelia sulcata
Photos: On Salix and ornamental Sorbus. County Cork, SW Ireland.
Grey-blue thallus, ridged, overlapping lobes with +/- brownish tips. Network of coarse white reticulation developing greyish soredia which may spread and cover centre of thallus. Black undersurface with rhizines. Apothecia infrequent, with +/- sorediate margins.
Common throughout Ireland on trees and rocks.
Medulla and soredia: K+ orange-red, C-, P+ orange, UV-
Parmelia sulcata. Co.Cork. December 2008 and January 2010