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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set not revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 1. Megalaria. Megalariaceae Hafellner (1984); Lecanorineae; Lecanorales.

Taxonomic Literature: Coppins B.J. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Ekman S. & Tønsberg T., Bryologist 99: 34-40 (1996); Hafellner H., Beih. Nova Hedwigia 79: 241-371 [302] (1984); Kantvilas G., Hafellner J. & Elix J.A., Lichenologist 31(3): 213-225 (1999); Tønsberg T., Sommerfeltia 14: 124-126 (1992); Schreiner E. & Hafellner J., Biblioth. Lichenol. 45: 1-291 [146-149] (1992).

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

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

Thallus: Crustose, rimose. Thallus Outline: Soon disappearing or persistent. Upper Surface: Green, grey, or white; 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, soon sessile. Margin: Prominent; external filaments absent. Exciple: Brown, green, grey, or white. Periphyses: Absent. Epithecium: Apical cells brown, green, or grey. Interascal Hyphae: Present, scarcely branched to distinctly branched, not or scarcely anastomosed to distinctly anastomosed. Hypothecium: Green.

Asci: Tholus thickened, amyloid, with non-amyloid narrow axial body and amyloid convergent flanks towards apex or with amyloid tube; dehiscence lecanoralean.

Ascospores: 1–2 to c. 8 per ascus, ellipsoid, broadly ellipsoid, or globose, 15-30 µm long, 7.5-15 µm wide, obtuse; septa present; transversally septate, 1-transversally septate; wall 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): ß-orcinol depsides, ß-orcinol depsidones, and (tri-)terpenoids.

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