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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Lumbsch H. T. (94-12-28); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 12. Lasallia. Umbilicariaceae Chevall. (1826); Umbilicariineae; Lecanorales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero
Special 7: 1-893 [388-389] (1985); Galloway D.J., Flora of New
Zealand Lichens: i-lxxiii, 1-662 [203], Wellington (1985); Krog H.
& Swinscow T.D., Nordic J. Bot. 6: 75-85 (1986); Llano G.A., A
monograph of the lichen family Umbilicariaceae in the western
hemisphere, Washington (1950); Poelt J. & Vezda A., Biblioth.
Lichenol. 9: 1-258 [133-134] (1977); Purvis O.W. in: Purvis O.W. et
al. (eds), The Lichen Flora of Great Britain and Ireland, London
(1992); Posner B. et al., Z. Naturforsch. 46c: 19-27 (1991).

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

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

Thallus: Foliose, not subdivided parts, umbilicate or lobed. Upper Surface: Black, grey, brown, red, white, or brownish yellow; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate or isidiate; not sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. 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 to substipitate. Margin: Indistinct; external filaments absent. Exciple: Black or brown. Periphyses: Absent. Epithecium: Apical cells black or brown. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Black or brown.

Asci: Tholus thickened, amyloid, entirely amyloid throughout; dehiscence lecanoralean.

Ascospores: 1–2 per ascus, broadly ellipsoid, ellipsoid, or oblong, 28-70 µm long, 18-34 µm wide, obtuse; septa present; both transversally and longitudinally, 5-99-transversally septate; wall thin, not thickened at the septum, dark brown or pale brown, 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 and (anthra-)quinones.

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