Order: Arthoniales       Family: Arthoniaceae Species: Arthonia cinnabarina Growth type crustose. Photos: On shaded Hazel. Ballingeary, Cork, SW Ireland. Thin light grey or orange-brown thallus with brown prothallus. Groups of small rounded, polygonal or linear apothecia, usually with pinkish or reddish-orange pruina that fades with age. Apothecia and orange areas K+ red or purple. Common throughout Ireland on shaded, smooth barked trees.

Arthonia cinnabarina. September 2009 and November 2010