Graphis persoonii

Thallus grey to brown, cracked, uneven. Ascomata straight, curved or branched; lirellae to 6 mm in length and 0.1–0.45 mm broad, with rounded or rarely with acute ends; young ascomata elliptical or rounded, mature lirellae elongate; discs exposed, non-pruinose, dark brown, shiny; thallus margin absent or appearing at the base of ascomata only; mostly erumpent, sometimes prominent and then with cracks along the base; true exciple 25–60 μm thick, black, the inner part frequently reddish brown. Ascospores 4–8 per ascus, 7- to 13- septate, 15–42 × 5–12 μm, the lumina irregular, elliptical or lentiform in section. Thallus mostly K–, sometimes K+ dirty reddish-brown.

This is one of the two less common species of the Graphis scripta s. lat. group. It differs from G. scripta s. str. in its conspicuously open, dark brown, non-pruinose discs, rather short ascomata and a reduced thallus margin. Referred to as Graphis macrocarpa (Pers.) Röhl. (1813) by Neuwirth & Aptroot (2011), but this combination appears not to exist.