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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): 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: 9. Thelopsis. Stictidaceae Fr. (1849); Ostropales.

Taxonomic Literature: Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M.,
Biblioth. Lichenol. 64: 1-220 [197-198] (1997); Clauzade G. &
Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893
[744] (1985); 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); Renobales G.,
Barreno E. & Atienza V., Lichenologist 28: 105-111 (1996); Rose
F. & in: James P.W. Purvis O.W. et al. (eds), The Lichen Flora of
Great Britain and Ireland, London (1992); Tretiach M. et al. in: Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert Region vol. 1, 482-483, Tempe (2002); Vezda A., Folia Geobot. Phytotax. 3: 363-406 (1968).

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

Ecology: Biotroph; lichenized; terricolous, bryophytic, or corticolous; substrate calciferous.

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

Thallus: Crustose, not subdivided parts. Thallus Outline: Soon disappearing. Upper Surface: Grey, green, brownish yellow, or orange; 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. Margin: Prominent; external filaments absent. Exciple: Black, brown, or white. Periphyses: Absent. Hymenium: Iodine reaction: hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed.

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

Ascospores: More than 32 per ascus, ellipsoid, 4-20 µm long, (2)-3-8-(20) µm wide; septa absent or present; transversally septate (to submuriform), 1-3-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.

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

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