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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; 06-08-07) and Triebel D. (98-01-01; 01-08-10; 03-01-19); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 11. Niesslia. Niessliaceae Kirschst. (1939); Hypocreales.

Type Information: Type: Niesslia chaetomium (Corda) Auersw. (= Niesslia exilis (Alb. & Schwein.: Fr.) Winter).

Taxonomic Literature: Taxonomic notes: Tretiach (2002) transfered Nitschkiopsis stictarum to Niesslia as N. stictarum (Nannf. & R. Sant.) Tretiach. Alstrup V. & Hansen E.S., Graphis Scripta 12: 41-50 (2001); Etayo
J., Bull. Soc. Linn. Provençe 47: 93-110 [103] (1996); Etayo
E. & Diederich P., Bull. Soc. Naturalistes Luxemb. 97: 93 118
[107-109] (1996); Etayo J., Bull. Soc. Linn. Provençe 51: 153-
162 (2001); Gams W., Cephalosporium-artige Schimmelpilze. G. Fischer
Verlag Stuttgart: 1-262 [151-166] (1971); Hansen E.S. & Alstrup
V., Graphis Scripta 7: 33-38 [37] (1995); Hawksworth D.L., Kew Bull.
30: 183-203 (1975); Müller E. & von Arx J.A., Beitr.
Kryptogamenfl. Schweiz 11(2): 1-922 [575-577] (1962); Samuels G.
& Barr M.E., Canad. J. Bot. 75: 2165-2176 (1997); Tretiach M.,
Nova Hedwigia 75(3-4): 357-366 (2002).

Biogeography: Checklist records: Germany, Great Britain, Italy, Sweden and Norway, and United States and Canada (continental).

Ecology: Saprobic or biotroph; lichenicolous or fungicolous; terricolous, lignicolous, corticolous, or epiphyllous; substrate non-calciferous.

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, soon sessile. Wall: Not carbonized, not fused. Margin: Prominent; external filaments present. Exciple: Black, brownish yellow, or brown. Periphyses: Present. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent or present, scarcely branched, not or scarcely anastomosed. Hypothecium: Black, brownish yellow, or brown.

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

Ascospores: c. 4 to c. 8 per ascus, ellipsoid, oblong, cylindrical, fusiform, or curved, 4.5-20-(22) µm long, 1-6-(6.5) µm wide, obtuse or aciculate; septa present; transversally septate, 1-transversally septate, formed by the proper spore wall; wall thin or thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented or ornamented.

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