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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Elix J. A. (95-06-01) and Randlane T. (98-02-21); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 20. Tuckermannopsis. Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Taxonomic Literature: Elix J.A., Bryologist 96: 359-383 (1993); Lai J.-M., Quat. J. Taiwan
Mus. 33: 215-229 (1980); Thell A., Goward T., Randlane T.,
Kärnefelt E.I. & Saag A., Bryologist 98: 696-605 (1995);
Thell A., Mattsson J.-E. & Kärnefelt I., Cryptog. Bot. 5:
120-127 (1995); Thell A., Randlane T., Kärnefelt I., Gao X.-Q.
& Saag A., in: Daniels F.J.A., Schulz M. & Peine J. (eds):
Flechten Follmann: 353-370, Cologne (1995).

Biogeography: Checklist records: Australia, Great Britain, Italy, New Zealand, Sonoran Desert, United States and Canada (continental), and Republic of South Africa.

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

Thallus: Foliose or crustose, not subdivided parts, subfruticose, lobed. Thallus Outline: Soon disappearing. Upper Surface: Grey, brown, or olive; special structures present:; not pseudocyphellate or pseudocyphellate; eciliate or ciliate; without hairs; not isidate or isidiate; not sorediate or sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by holdfasts; special structures present:; not pseudocyphellate or pseudocyphellate; not cyphellate; rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular or lingulate, forming directly at the thallus margin, becoming adnate to soon sessile. Margin: Distinct to prominent; external filaments absent. Exciple: Grey or white. Periphyses: Absent. Epithecium: Apical cells brown or brownish yellow. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White.

Asci: Tholus thickened, amyloid, with non-amyloid wide axial body and divergent amyloid flanks towards apex; dehiscence lecanoralean.

Ascospores: c. 8 per ascus, globose or broadly ellipsoid, 3-5 µm long, 3-5 µm wide, obtuse; septa absent; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

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

Secondary Metabolites: Present, of the following substance class(es): orcinol depsides, orcinol depsidones, ß-orcinol depsides, and (higher) aliphatic acids.

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