Family: Parmeliaceae
Parmelia sulcata Taylor
Type: Foliose
Widespread on both trees and rocks. Similar to Parmelia saxatilis but differs in having laminal soralia and not isidia
References:
Smith, C.W. et al. editors (2009) The Lichens of Great Britain and Irelandd
Dobson, F.S. (2018) Lichens: an Illustrated Guide to the British and Irish Species
Thell & Moberg, editors (2011) Nordic Lichen Flora, Volume 4: Parmeliaceae