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Data Set Maintenance: Data set standard item. Data set author(s): Triebel D. Data set reviewer(s): Scholz P. (06-06-12) and Triebel D. (98-01-01; 02-03-27); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Perigrapha. Opegraphaceae Stizenb. (1862); Arthoniales.

Taxonomic Literature: Ertz D., Christnach C., Wedin M. & Diederich P., Biblioth. Lichenol. 91: 1-155 [135-138] (2005); Hafellner J., Nova Hedwigia 63: 173-181 (1996); Hafellner J., Mycotaxon 80: 381-387 (2002);.

Medulla: Iodine reaction in Lugol's solution negative; not different with or without KOH pre-treatment (euamyloid).

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, orbicular, not emerging, stromatic. Wall: Carbonized around the ostiole, lacking a clypeus, not fused. Margin: Prominent; external filaments absent. Exciple: Black or brown. Periphyses: Absent. Epithecium: Apical cells brownish yellow. Hymenium: Iodine reaction: Lugol’s negative, hemiamyloid. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed. Hypothecium: Brownish yellow.

Asci: Tholus thickened, amyloid, with amyloid tube; dehiscence bitunicate; exoascus not amyloid, hemiamyloid.

Ascospores: c. 4 to c. 8 per ascus, fusiform, 30-35 µm long, 4.5-6 µm wide, aciculate; septa present; transversally septate, 3-transversally septate, formed by the proper spore wall; wall thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, hyaline or pale brown, in Lugol's Solution negative, wall not ornamented or ornamented.

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