Peltigera membranacea (Ach.) Nyl.
Membranous Dog Lichen
Blue-grey to brownish or ash-grey when dry, with a densely densely felted-tomentose, bullate surface.Under-surface with prominent veins bottle-brush shaped rhizines. Very common and found in a wide range of habitats, particularly around mossy trees, in moist grassland and dunes
Smith et al. editors (2009) The Lichens of Great Britain and Ireland
Dobson (2018) Lichens: an Illustrated Guide to the British and Irish Species
Ahlti et al. editors (2012) Noric Lichen Flora. Volume 3: Cyanolichens