Order: Lecanorales       Family: Parmeliaceae Species: Parmelia saxatilis sens. lat. Growth type foliose. Photos: On acidic upland rock. Ballingeary, Cork, SW Ireland. Blue-grey to greenish-grey thallus, ridged lobes, tips often browned. Simple rhizines. Conspicuous white pseudocyphellae, grey brown isidia form on reticulation and can spread to cover thallus. Apothecia rare, red-brown with thin crenulate or isidiate margins. Sometimes parasitised by Marchandiomyces corallinus but mite damage can cause similar discolouration (bottom photograph) Common on walls, rocks and acid barked trees. Medulla: K+ orange turning red, C-, P+ orange, UV- The aggregate comprises Parmelia ernstiae, P. saxatilis, P. serrana. Parmelia saxatilis s. str. needs DNA analysis for certain identification. Similar: Parmelia sulcata is sorediate, isidia absent.

     








Parmelia saxatilis sens lat.