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Data Set Maintenance: Data set standard item. Data set author(s): Triebel D. Data set reviewer(s): Triebel D. (98-01-01; 01-08-15; 02-03-27); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 3. Obryzum. Valsaceae Tul. & C. Tul. (1861); Diaporthales.

Taxonomic Literature: Aptroot A. & Sipman H. J. M., J. Hattori Bot. Lab. 91: 317-343 [333-334](2001); Eriksson E., Opera Bot. 60: 1-209 [113] (1981); Kalb K. & Hafellner J., Herzogia 9: 45-102 [76] (1992); Hoffmann N. & Hafellner J., Biblioth. Lichenol. 77: 1-190 [80-90] (2000); Keissler K. von, Rabenh. Kryptog.-Fl. 8: 1-712 [348-350] (1930) - sub Guignardia corniculata; Santesson R., The lichens and lichenicolous fungi of Sweden and Norway, Lund: 1-240 [148] (1993).

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

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Perithecioid, orbicular, not emerging, soon sessile. Wall: Carbonized around the ostiole, lacking a clypeus (densely carbonized above and on the sides), not fused. Margin: External filaments absent. Exciple: Black, white, or brownish yellow. Periphyses: Absent or rarely present. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent. Hypothecium: Pale brown or brownish yellow.

Asci: Tholus not thickened, not amyloid; dehiscence unitunicate; exoascus not amyloid, not hemiamyloid.

Ascospores: c. 4 or c. 8 per ascus, ellipsoid, clavate, or fusiform, 9-17-(21) µm long, 3-7 µm wide, aciculate; septa absent; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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