Order: Arthoniales       Family: Arthoniaceae Species: Coniocarpon cinnabarinum (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. Asci 8-spored, spores (2-)4-5(-6) septate, (18-)20-28 x 7-9.5 µm. Older spores can become brown. Microscope photograph below. Apothecia and orange areas K+ red or purple. Common throughout Ireland on shaded, smooth barked trees. Simiar: Arthonia elegans. Larger apothecia and spores.

Microscope photograph

Arthonia cinnabarina. September 2009, November 2010 and April 2012