Arthoniaceae Pachnolepia pruinata (Arthonia pruinata) Growth type crustose Chemical results: K-, C+ red, P-, UV- Can be dominant on the dry bark of old, well-lit trees (e.g Oak, Sycamore). Most frequent in the south of England. Matt or powdery light-grey to brownish thallus, the immersed apothecia pink or brown and usually very pruinose. Spores remaining colourless, (3-)4-5 septate, 13-22 x 4.5-7 µm. Upper cell not enlarged. Micro photos below. Sterile specimens resemble Schismatomma decolorans which is C-

Microscope photographs



Arthonia pruinata
Holton Lee and Lytchett Minster, Dorset. February 2013, December 2016