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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Aptroot A. (00-4-13), Triebel D. (00-4-13), and Scholz P. (02-05-17); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 10. Tomasellia. Xanthopyreniaceae Zahlbr. (1926); Pyrenulales.

Taxonomic Literature: Taxonomic notes: The family placement is still with questionmark (Aptroot pers. com.). Aptroot A. in: Nash T.H. III et al. (eds) Lichen Flora of the Greater
Sonoran Desert Region vol. 1, 487-488, Tempe (2002); Coppins B.J. in:
Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and
Ireland, London (1992); 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., More Florida lichens including the 10c tour of the
pyrenolichens: 1- 192 [64-66], Bronx, NY (1995).

Biogeography: Checklist records: Austria, Germany, Great Britain, Guianas, Italy, Sonoran Desert, United States and Canada (continental), and Republic of South Africa.

Lichen Photobionts: Primary photobiont absent or present. Secondary photobiont absent.

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

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Perithecioid, orbicular or irregular, forming all across the thallus surface, not emerging, stromatic (ascomata usually aggregated). Wall: With a carbonized black clypeus around the ostiole. Margin: Prominent; external filaments absent. Exciple: Black, brown, white, or brownish yellow. Periphyses: Absent. Interascal Hyphae: Present, distinctly branched, not or scarcely anastomosed. Hypothecium: Black, brown, white, or brownish yellow.

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

Ascospores: c. 8 per ascus, ellipsoid or clavate, 15-26 µm long, 3-8 µm wide, obtuse or aciculate; septa present; transversally septate, 1-(never 2)-3-transversally septate, formed by the proper spore wall; wall thin, not thickened at the septum, dark brown, hyaline, or pale brown, in Lugol's Solution negative, wall not ornamented or ornamented.

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