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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Aptroot A. (95-02-10, 95-02-95) and Triebel D. (98-01-01); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 7. Parapyrenis. Requienellaceae Boise (1986); Pyrenulales.

Taxonomic Literature: Aptroot A., Biblioth. Lichenol. 44: 1-178 (1991); Aptroot A., Nova Hedwigia 60: 325-379 [96-101] (1995); Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M., Biblioth. Lichenol. 62: 1-220 [125-127] (1997).

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Perithecioid, orbicular, forming all across the thallus surface, not emerging, becoming adnate to soon sessile, stromatic. Wall: With a carbonized black clypeus around the ostiole or not carbonized, not fused. Margin: Prominent; external filaments absent. Exciple: Black or brown. Periphyses: Absent or present. Hymenium: Oil inspersed, iodine reaction: Lugol’s negative or Lugol’s positive, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed.

Asci: Tholus thickened, not amyloid; ocular chamber indistinct; dehiscence bitunicate; exoascus not amyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid, 11-24 µm long, 5-12 µm wide, obtuse or aciculate; septa present; transversally septate, 1-transversally septate, formed by the proper spore wall or endospore wall layer; wall thin, not thickened at the septum, laterally constricted where the septum meets the spore wall, dark brown, in Lugol's Solution negative, wall not ornamented.

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