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Graphis cerradensis Marcelli, Benatti & Lücking
Nomenclature
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Family: GraphidaceaeGenus: Graphis
SUMMARY
Mycobank MB 517775
Thallus corticolous, up to 5 cm diam., 30–70 µm thick, continuous; surface smooth to uneven, matte, pale greenish grey; prothallus absent. Thallus in section with cartilaginous upper cortex, irregular algal layer and large clusters of crystals. Apothecia lirelliform, flexuose, unbranched to sparsely branched, prominent, with thick complete thalline margin, 1–3 mm long, 0.5–0.6 mm wide, 0.25–0.35 mm high; disc concealed; proper margin thick, labia striate; thalline margin thick, completely covering the labia, white. Excipulum apically crenulate, completely carbonized, 70–150 µm wide, black; laterally covered by corticate algiferous thallus including large clusters of crystals; hypothecium prosoplectenchymatous, 10–15 µm high, colourless to pale yellowish; hymenium 150–200 µm high, colourless, strongly inspersed with small granules along the paraphyses (paraphyses and asci hardly discernible), inspersion rapidly disappearing in KOH (type B); epithecium granulose, 10–15 µm high, olive brown. Paraphyses unbranched; asci fusiform to clavate, 130–180 x 30–40 µm. Ascospores 4–8 per ascus, oblong, muriform with 15–25 transverse and 1–3 longitudinal septa per segment, 80–100 x 15–20 µm, 6–7 times as long as wide, colourless. Secondary chemistry: stictic acid.