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Data Set Maintenance: Data set compiled. Data set author(s): Helms G. (01-01-22). Data set reviewer(s): Helms G.; not to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Currently accepted name Buellia disciformis. Buellia. Physciaceae Zahlbr. (1898); Lecanorineae; Lecanorales.

Biogeography: Northern hemispheric. Continent: Asia-Temperate, Europe, and Northern America. Checklist records: Great Britain, Sweden and Norway, and United States and Canada (continental).

Thallus: Crustose, not subdivided parts, rimose. Thallus Outline: Distinct; often persistent. Upper Surface: White or grey-yellow; eciliate; without hairs; not isidate. Lower Surface: Absent, firmly attached attached; attached by the whole lower surface.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Orbicular, forming in the thallus centre, becoming adnate, abundant, .3-1.3 mm in diam.. Disk: Plane to slightly weakly convex. Epithecium: Apical cells brown.

Ascospores: (13)-17-26-(30) µm long, 7-10-(13) µm wide; septa present; transversally septate; 1-3-transversally septate.

Secondary Metabolites: Present; atranorin (and two or more unidentified substances).

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