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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); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 12. Psiloparmelia. Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Taxonomic Literature: Elix J.A., Bryologist 96: 359-383 (1993); Elix J.A. & Nash III T.H., Bryologist 95: 377-391 (1992); Hale M.E., Mycotaxon 35: 41-44 (1989); Lumbsch T.H., Schuster G., Elix J.A., Nash III T.H., Mycotaxon 42: 77-87 (1992).

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

Thallus: Crustose or foliose, not subdivided parts, squamulose, lobed. Upper Surface: Green or yellow; special structures absent. Lower Surface: Attached by holdfasts; special structures absent.

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, soon sessile. Margin: 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, ellipsoid, 10-12 µm long, 6-8 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, formed all accross the thallus surface.

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

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