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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; 01-08-12); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: genus. Number of known taxa within this rank: 4. Didymellopsis. Genus of unknown placement (incertae sedis); Dothideales.

Taxonomic Literature: Grube M. & Hafellner J., Nova Hedwigia 51: 283-360 [291, 293, 296-
305] (1990); Kocourková J., Acta Mus. Nat. Pragae, Ser. B., Hist. Nat. 55 (3-4): 59-169 [81] (2000); Zopf W., Nova Acta Acad. Caes. Leop.-Carol. German. Nat. Cur. 70: 242-288 [286-288] (1898).

Ecology: Biotroph; lichenicolous; terricolous or bryophytic; substrate non-calciferous or 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, not emerging, becoming adnate to soon sessile. Margin: External filaments absent. Exciple: Black or brown. Periphyses: Absent or present. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Absent or present, scarcely branched to distinctly branched, not or scarcely anastomosed to distinctly anastomosed. Hypothecium: Black or brown.

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

Ascospores: c. 4 to c. 8 per ascus, broadly ellipsoid, ellipsoid, ovoid, or oblong, 11.5-26 µm long, 4-10 µm wide, obtuse or aciculate; septa present; transversally septate, 1-transversally septate; 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.

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