Order: Lecanorales       Family: Parmeliaceae Species: Parmotrema perlatum Growth type foliose. Photos: On twigs, branches and rock. County Cork, SW Ireland. Bluish-grey to light-grey orbicular thallus, incised, ascending lobes. Undulating margins with powdery soralia and black cilia. Apothecia rare. Underside black with rhizines at centre, tan-colored and bare at margins. (P. reticulatum has rhizines extending to margins.) Common throughout Ireland on trees, bushes and +/- acidic rocks. Medulla and soralia: K+ orange-yellow, KC+ orange, P+ orange, UV- Similar: Parmotrema crinitum

     
Parmotrema perlatum on acidic rock and Larch and Oak twigs and branches.