Arthoniaceae Coniocarpon fallax (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, sometimes with red pruinose edges. Spores (2-)3-4(-5) septate with upper cell enlarged, (12-)14-19 × 4.5-7 µm. Pycnidia absent. Microscope photograph below. Can be confused with Arthonia cinnabarina and Arthonia radiata

Microscope photograph

Arthonia elegans
Studland Heath, Dorset. March 2015