Lichenicolous on Melanelixia glabratula with black apothecia.
Seen as black arthonioid disks on Melanelixia glabratula, ascospores brown 1 septate, 10.5 – 15 x (4–) 4.5 – 6 (–7) µm. See Fungi of Great Britain and Ireland.
On Melanelixia glabratula, which occurs on mesic bark in well lit situations, typically on the trunk or branches well below the canopy.
Widepread and probably under recorded, not recorded from central eastern England, where its host is still recolonising after the decline of SO2 pollution.
Hawksworth, D. L., Atienza, V. & Coppins, B. J. (2010) Draft Artifical Keys to the Lichenicolous Fungi of Great Britain, Ireland, the Channel Islands, Iberian Peninsula, and Canary Islands. Link