Irish lichens

Cetrelia olivetorum

Order: Lecanorales       Family: Parmeliaceae

Species: Cetrelia olivetorum

Growth type foliose.
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


Cetrelia olivetorum


Cetrelia olivetorum
Cetrelia olivetorum. November 2010

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