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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: 4. Acanthonitschkea. Nitschkiaceae (Fitzp.) Nannf. (1932); Sordariales.

Taxonomic Literature: Alstrup V. & Olech M., Polish Polar Res. 14: 33-42 (1993) - sub Hystrix; Eriksson O.E., The non-lichenized pyrenomycetes of Sweden, Lund: 1-208 [15] (1992); Eriksson O.E. & Hawksworth D.L., Syst. Ascomycetum 14: 41-77 [54-55] (1995); Hilber O., Hilber R. & Enderle M., Mitt. Ver. Naturwiss. Mathem. Ulm 32: 77-199 [134-137] (1983); Nannfeldt J.A., Svensk Bot. Tidskr. 69: 49-66 (1975a); Nannfeldt J.A., Svensk Bot. Tidskr. 69: 289-335 (1975b); San Martín F. & Lavin P.A., Acta Botánica Mexicana 41: 31- 41 (1997) - sub Acanthonitschki(!)a; Zhurbenko M. & Santesson R., Herzogia 12: 147-161 [149] (1996).

Ecology: Biotroph or saprobic; fungicolous or lichenicolous; terricolous, lignicolous, or corticolous.

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, stromatic. Margin: Prominent; external filaments absent or present. Exciple: Black or brown. Periphyses: Absent or present. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent. Hypothecium: Black or brown.

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

Ascospores: c. 8 or 16-32 per ascus, ellipsoid, oblong, allantoid, curved, filiform, fusiform, or ovoid, 4-40 µm long, 1.5-3 µm wide, obtuse or aciculate; septa absent or present; transversally septate, 1-1-transversally septate; wall thin or 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.

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