A foliose lichen with large, grey-white tomentose lobes that are grey when dry and brown when wet. The lobes are broad and rounded, bullate, with the margins characteristically curled under. The under surface is white to tan, usually with conspicuous veins and long, rather loose, fibrous or bottlebrush-shaped rhizines. The red-brown apothecia are large and elliptical.
Peltigera membranacea is common across Scotland and is often found among mosses on soil, rock and trees. BLS distribution map
Peltigera membranacea is distinguished from Peltigera hymenina on basis of its bullate rather than smooth lobes and curled-under rather than upright margins. Peltigera membranacea is distinguished from Peltigera canina on basis of the less bushy and beard-like rhizines.
scottishlichens.co.uk 