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Data Set Maintenance: Data set standard item. Data set author(s): Triebel D. (00-03-21). Data set reviewer(s): Aptroot A. (00-3-27) and Scholz P. (02-05-16); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 3. Pleomassariaceae M.E. Barr (1979); Pleosporales.

Taxonomic Literature: Aptroot A. in: Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 340-341, Tempe (2002); Atienza V., Anales Jard. Bot. Madrid 50(2): 159-162 (1992); Barr M. E., Mycotaxon 43: 371-400 [371] (1992); Hawksworth D.L., Bull. Brit. Mus. (Nat. Hist.), Bot. 14: 43-181 [120-130] (1985); Triebel D., Rambold G. & Nash T.H. III, Mycotaxon 42: 263-296 (1991).

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

Thallus: Indistinct or crustose. Upper Surface: Special structures absent. Lower Surface: Special structures absent.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Perithecioid, orbicular, not emerging, becoming adnate to soon sessile. Wall: Not carbonized, carbonized around the ostiole, lacking a clypeus, or with a carbonized black clypeus around the ostiole (Aptroot (unpubl.)), not fused. Margin: Distinct to prominent; external filaments absent. Exciple: Black or brown (dark reddish). Periphyses: Absent. Hymenium: Iodine reaction: Lugol’s positive. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed. Hypothecium: White.

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

Ascospores: c. 8 per ascus, ellipsoid (to soleiform), (16)-17-33-(35) µm long, 7-12-(13) µm wide, obtuse or aciculate; septa present; transversally septate, 1-transversally septate, formed by the proper spore wall; wall thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, laterally constricted where the septum meets the spore wall, middle brown (reddish brown), in Lugol's Solution negative, wall not ornamented or ornamented.

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