Phaeographis inusta  (Ach.) Mull. Arg.

    Thallus crustose, very thin, bark colour visible through, almost smooth, glossy, pale grey, pale grey-greenish, pale grey-yellowish. Apothecia lirellate, flat, 1-2 mm long, 0.1-0.3 mm wide, immersed in the thallus, indistinct exciple, simple or stellate, but most often suggesting chinese calligraphy and chinese writings (Westerners perception of course!), disc blackish, grey-blackish, not powdery. Ascospores narrowly fusiform, 3-5-septate, 16-25 x 7-9 µm. Chemical spot tests negative. Rare, on smooth bark of deciduous trees and notably hazel (Corylus). See Phaeographis dendritica and Phaeographis smithii which are K+ red and Pd+ yellow, and for some forms with Graphis scripta with narrower lirella and different spores.