On bark.Thin grey thallus, black apothecia 0.2-0.5 mm. Paraphyses not branching, with expanded brown tips. Spores are bean-shaped, two-celled, green to brown in maturity, 9-12 x 5-6 µm.
On deciduous bark. Biatorine apothecia on grey-green thallus. Tholi KI+ dark blue. Spores 8 per ascus, 3-septate, (14-)15.8-19.4(-20) X (3.4-)3.9-5(-5.6) µm, length/width 3.9+/-0.65.