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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); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 8. Trapelia. Agyriaceae Corda (1838); Agyriineae; Lecanorales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero
Special 7: 1-893 [758-759] (1985); Coppins B.J. & James P.W.,
Lichenologist 16: 254-257 (1984); Galloway D.J., Flora of New Zealand
Lichens: i-lxxiii, 1-662 [583-584], Wellington (1985); Lumbsch H.T.,
Kashiwadani H. & Streimann H., Pl. Syst. Evol. 185: 285-292
(1993); Purvis O.W. in: Purvis O.W. et al. (eds), The Lichen Flora of
Great Britain and Ireland, London (1992).

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

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

Lichen Photobionts: Primary photobiont present; chlorococcal. Primary photobiont taxonomy: Chlorella saccharophila-group (A. Beck 19-05-97); genus incertae sedis; Dictyochloropsis-group, Trebouxiophyceae, Eukariota. Secondary photobiont absent.

Thallus: Crustose, not subdivided parts, squamulose, placodioid, granular, rimose, or areolate (primarily areolate). Upper Surface: Grey, green, olive, brownish yellow, or pink (rosé); 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.

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, becoming adnate to soon sessile. Margin: Distinct to prominent; external filaments absent. Exciple: Brown, white, or brownish yellow. Periphyses: Absent. Epithecium: Apical cells hyaline or brownish yellow. Hymenium: Iodine reaction: Lugol’s negative, hemiamyloid. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed. Hypothecium: Brown, white, or brownish yellow.

Asci: Tholus thickened, not amyloid or amyloid, with amyloid cap or tube and flanks or with amyloid cap; dehiscence lecanoralean; exoascus euamyloid, not hemiamyloid.

Ascospores: c. 8 per ascus, ellipsoid, 11-25 µm long, 5-13 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: Present, of the following substance class(es): orcinol depsides.

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