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Data Set Maintenance: Data set standard item. Data set author(s): Triebel D. Data set reviewer(s): Triebel D. (99-02-12); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 21 (A. Aptroot 99-09-27). Pyrenocollema. Genus of unknown placement (incertae sedis); Dothideales.

Taxonomic Literature: Almaraz T., Checa J. & Gallardo T., Anales Jard. Bot. Madrid 52(1): 3-6 (1994); Aptroot A. & Van den Boom P.P.G., Cryptog. Bryol. Lichénol. 19(2-3): 193-196 (1998); Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [651] (1985); Coppins B.J. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Fletcher A., Lichenologist 7: 1-52 (1975); Grube M. & Hafellner J., Nova Hedwigia 51: 283-360 [291-294] (1990); 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); Poelt J., Bestimmungsschlüssel Europäischer Flechten: 1-757 [547] (1969); Santesson R., Ark. Bot. 29A(10): 1-67 (1939).

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

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

Thallus: Indistinct or crustose, not subdivided parts, placodioid or granular. Upper Surface: Black; special structures absent. Lower Surface: Attached by the whole lower surface; special structures absent.

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, forming all across the thallus surface, not emerging, becoming adnate to soon sessile. Margin: Indistinct; external filaments absent. Exciple: Brown. Periphyses: Absent. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, scarcely branched to distinctly branched, distinctly anastomosed. Hypothecium: Brown.

Asci: Ocular chamber indistinct; dehiscence bitunicate; exoascus not amyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, clavate, 12-25 µm long, 5-9 µm wide; septa absent or present; transversally septate, 1-1-transversally septate, formed by the proper spore wall; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented or ornamented.

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