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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Aptroot A. (00-02-02), Triebel D. (00-02-02), and Scholz P. (02-05-13); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 10 (estimation provided by A. Aptroot 99-09-27). Acrocordia. Monoblastiaceae W. Watson (1929); Pyrenulales.

Taxonomic Literature: Aptroot A. in Nash T.H. III et al. (eds), Lichen Flora of the Greater Sonoran Desert Region Vol. 1: 89 (2002); Galloway D.J., Flora of New Zealand Lichens: i-lxxiii, 1-662 [3-4], Wellington (1985); Harris R.C., Michigan Bot. 12: 3-68 (1973); Harris R.C., A taxonomic revision of the genus Arthopyrenia A. Massal. s. lat. (Ascomycetes) in North America. - Ph. D. diss., Michigan State Univ., East Lansing (1975); Harris R.C., Some Florida lichens: 1-109 [28], Bronx, NY (1990); Harris R.C., More Florida lichens including the 10c tour of the pyrenolichens: 1-192 [122], Bronx, NY (1995); Poelt J. & Vezda A., Biblioth. Lichenol. 9: 1-258 [9-11] (1977);
Purvis O.W. in: Purvis O.W. et al. (eds), The Lichen Flora of Great
Britain and Ireland, London (1992).

Biogeography: Checklist records: Austria, Germany, Great Britain, Italy, New Zealand, Sonoran Desert, Thailand, and United States and Canada (continental).

Lichen Photobionts: Primary photobiont present; trentepohlioid. Secondary photobiont absent.

Thallus: Indistinct or crustose, not subdivided parts, rimose. Upper Surface: Grey, brown, white, brownish yellow, or pink (rosé); special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Perithecioid, orbicular, forming all across the thallus surface, not emerging, becoming adnate to soon sessile. Wall: Not carbonized, not fused. Margin: Prominent; external filaments absent. Exciple: Black (rarely pink or whitish), brown, or brownish yellow. Periphyses: Absent. Interascal Hyphae: Present, scarcely branched to distinctly branched, not or scarcely anastomosed. Hypothecium: White or brownish yellow.

Asci: Tholus thickened, not amyloid; ocular chamber indistinct or broad; dehiscence bitunicate.

Ascospores: Rarely c. 4 to c. 8 per ascus, ellipsoid to oblong-obtuse to oblong, 11-60 µm long, 5.5-23 µm wide, obtuse; septa present; transversally septate, 1-1-(3)-transversally septate, formed by the proper spore wall; wall thickened at the septum, laterally constricted where the septum meets the spore wall, hyaline, in Lugol's Solution negative, wall ornamented.

Conidiomata: Absent resp. not observed to present; pycnidial; formed all accross the thallus surface.

Conidiogeneous Cells: Apical. Conidia: Globose; microconidial; aseptate; up to 0-septate; cell wall hyaline.

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