Arthoniaceae Coniocarpon cinnabarinum (Arthonia cinnabarina) Growth type crustose Chemical results: Apothecia and orange areas K+ red or purple Can be common in old woodlands on shaded, smooth bark of young trees and branches Thin, light grey or pale fawn thallus, often tinged orange. Apothecia with white or red pruina, becoming reddish-brown when old. Spores 3-5 septate, 20-28 x 7-10 µm, brown when old. Microscope photographs below. Similar: Coniocarpon cuspidans (A. elegans), smaller apothecia and spores

Microscope photographs





Coniocarpon cinnabarinum (Arthonia cinnabarina)
Dorset. September 2013 and January 2025