Arthoniaceae Arthonia phaeophysciae # Chemical results: Hypothecium K+ grey Occasional. Lichenicolous on Phaeophyscia orbicularis, Phaeophyscia endophoenicea and Phaeophyscia sciastra. BLS conservation evaluation: LC NS Thallus absent, the abundant black apothecia breaking through the host cortex. Spores 1-septate but septum often indistinct, 12-14 × 4-6 µm. Microscope photograph below. Similar: Arthonia epiphyscia is confined to Physcia species

Microscope photograph

Arthonia phaeophysciae
Studland, Dorset. May 2015