Order: Lecanorales Family: Parmeliaceae
Species: Cetrelia olivetorum
Photos: Killarney NP, Co. Kerry, SW Ireland.
Identified by John Douglass
Large greyish thallus, lobes with small, scattered, punctiform pseudocyphellae on the upper surface and marginal soralia. Underside of lobes black with simple rhizines in centre, becoming smooth and whitish-brown near tips. Apothecia absent.
Three chemotypes; K-, C-, P- or K+ red, KC- or KC+ pink or red.
Infrequent on mossy, acid-barked trees like Hazel and Salix in damp, well-lit woodland and carr. Scattered, local distribution in Ireland.
Similar: Platismatia glauca, crisped lobes without pseudocyphellae
Cetrelia olivetorum. November 2010