Order: Lecanorales       Family: Parmeliaceae Species: Cetrelia olivetorum sens.lat. Growth type foliose. Identified by John Douglass Photos: Killarney NP, Co. Kerry, SW Ireland. 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. The four chemotypes are recognised as segregate species: Cetrelia cetrarioides C-, KC-, UV+ bright blue-white, common C. chicitae C-, KC+ pink to red, UV+ white (paler), very rare. C. monachorum C-, KC-, UV-, very rare. C. olivetorum s.str. C+ pink to reddish, KC+ red, UV-, rare. Found 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 sens.lat. November 2010