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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: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 2. Tylothallia. Biatoraceae A. Massal. ex Stiz. (1862); Lecanorineae; Lecanorales.

Taxonomic Literature: Fox B.W. & James P.W. in: Purvis O.W. et al. (eds), The Lichen Flora of Great Britain and Ireland, London (1992); Hertel H., Beih. Nova Hedwigia 79: 399-499 (1984); Rambold G., Biblioth. Lichenol. 34: 1-346 (1989).

Biogeography: Checklist records: Great Britain, New Zealand, and United States and Canada (continental).

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

Thallus: Crustose, rimose. Thallus Outline: Soon disappearing or persistent. Upper Surface: Grey or white; special structures absent. 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: Distinct to prominent; external filaments absent. Exciple: White or brownish yellow. Periphyses: Absent. Epithecium: Apical cells black, brown, green, or olive. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed.

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

Ascospores: c. 8 per ascus, oblong or oblong-obtuse, 10-15 µm long, 2.5-5 µm wide, obtuse; septa absent or present; transversally septate, 1-transversally septate; 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): orcinol depsides, ß-orcinol depsides, and ß-orcinol depsidones.

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