Graphis marusae B. Peña & Lücking  

Mycobank MB 517777

Thallus corticolous, up to 5 cm diam., 50–100 µm thick, continuous; surface smooth, pale greenish grey, shiny; prothallus absent. Thallus in section with cartilaginous upper cortex, irregular algal layer and clusters of crystals. Apothecia lirelliform, flexuose, usually unbranched, prominent, lacking or with indistinct basal to lateral thalline margin, 1–5 mm long, 0.2–0.3 mm wide, 0.2–0.25 mm high; disc concealed; proper margin thick, labia for a long time entire but eventually becoming striate; thalline margin indistinct, thin, basal to almost lateral, greenish grey, the grey-black labia almost fully exposed. Excipulum entire to apically crenulate, completely carbonized, 80–120 µm wide, black; basally covered by thin thallus layer; hypothecium prosoplectenchymatous, 10–20 µm high, colourless; hymenium 100–150 µm high, colourless, clear; epithecium indistinct. Paraphyses unbranched; asci fusiform, 90–120 x 25–35 µm. Ascospores 8 per ascus, oblong, 9–13-septate, 50–70 x 10–15 µm, 4–5 times as long as wide, colourless. Secondary chemistry: no substances detected by TLC.