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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); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 1. Xenonectriella. Hypocreaceae De Not. (1844); Hypocreales.

Taxonomic Literature: Keissler K. von, Rabenh. Kryptog.-Fl. 8: 1-712 [289-292] (1930); Rogerson C.T., Mycologia 62: 865-910 [881] (1970); Rossman A.Y., Samuels G.J., Rogerson C.T. & Lowen R., Genera of the Hypocreales: 1-7 (1993) - [unpublished manuscript presented at the First International Workshop on Ascomycete Systematics, Paris]; Samuels G.J., Mem. New York Bot. Gard. 48: 1-77 [3] (1988); Santesson R., The lichens and lichenicolous fungi of Sweden and Norway, Lund: 1-240 [239] (1993); Vouaux L., Bull. Trimestriel Soc. Mycol. France 28: 177-256 [192-193] (1912) - sub Pleonectria lutescens; Weese J., Sitzungsber. Kaiserl. Akad. Wiss., Math.-Naturwiss. Cl., Abt. 1, 128: 693-754 + tab. [736-749 + tab. 1, fig. 1-4 (1919)].

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, becoming adnate to soon sessile. Margin: External filaments absent. Exciple: Red. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent or present, scarcely branched, not or scarcely anastomosed. Hypothecium: Red.

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

Ascospores: 1–2 to c. 4 per ascus, ellipsoid, broadly ellipsoid, curved, cylindrical, or oblong-obtuse, 8-60 µm long, 6.5-11 µm wide, obtuse; septa present; transversally septate or both transversally and longitudinally, 1-15-transversally septate; wall not thickened at the septum, dark brown, middle brown, grey, or hyaline, in Lugol's Solution negative, wall ornamented.

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