Arthoniaceae Coniocarpon cuspidans (Arthonia elegans) Growth type crustose Chemical results: Apothecia K+ red-purple Found in sheltered woodland, usually on smooth bark of Hazel (Corylus). Mosiac-forming immersed whitish-yellow or yellowish-brown thallus usually with delimiting orange-brown line. Linear, branched or stellate apothecia, purplish-brown, without pruinose edges. Spores (2-)3(-4) septate with upper cell enlarged, (15-)16-18(-20) x (6-)7-8(-9) µm. Pycnidia absent. Microscope photograph below. Can be confused with Arthonia cinnabarina and Arthonia radiata. Coniocarpon fallax, margins are orange-red pruinose

Microscope photograph

Coniocarpon cuspidans (Arthonia elegans)
Studland Heath, Dorset. March 2015