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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Lumbsch H. T. (98-03-19) and Scholz P. (06-06-12); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 4. Schaereria. Schaereriaceae M. Choisy ex Hafellner (1984); Agyriineae; Lecanorales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [705-706] (1985); Hafellner H., Beih. Nova Hedwigia 79: 241-371 [339-340] (1984); Hawksworth D.L. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Kantvilas G., Lichenologist 31(3): 231-238 (1999); Lumbsch H.T., J. Hattori Bot. Lab. 83: 1-73 (1997); Lunke T., Lumbsch H.T. & Feige G.B., Bryologist 99: 53-63 (1996); Poelt J. & Vezda A., Biblioth. Lichenol. 9: 1-258 [239] (1977); Rambold G., Biblioth. Lichenol. 34: 1-346 (1989); Schneider G., Biblioth. Lichenol. 13: 1-291 (1979); Tønsberg T., Sommerfeltia 14: 1-331 (1992).

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; chlorococcal. Primary photobiont taxonomy: Trebouxia (A. Beck 22-05-97); Trebouxiaceae; Trebouxiales, Trebouxiophyceae, Eukariota. Secondary photobiont absent.

Thallus: Indistinct or crustose, not subdivided parts, rimose, areolate (primarily areolate), or squamulose. Thallus Outline: Soon disappearing or persistent. Upper Surface: Grey or brown; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate or sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by the whole lower surface; special structures absent or present:; not pseudocyphellate; not cyphellate; not 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, forming all across the thallus surface, not emerging, becoming adnate to soon sessile. Margin: Indistinct to prominent; external filaments absent. Exciple: Brown. Periphyses: Absent. Epithecium: Apical cells green or olive. Hymenium: Iodine reaction: Lugol’s negative, not hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White, brownish yellow, or brown.

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

Ascospores: c. 8 per ascus, globose, ellipsoid, broadly ellipsoid, or oblong, 6-20 µm long, 5-14.5 µm wide, obtuse; septa absent; 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.

Secondary Metabolites: Not detected or present, of the following substance class(es): orcinol depsides.

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