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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Moberg R. (95-11-28); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 3. Santessonia. Physciaceae Zahlbr. (1898); Lecanorineae; Lecanorales.

Taxonomic Literature: Hale M.E. & Vobis G., Bot. Notiser 131: 1-5 (1978); Rambold G.,
Mayrhofer H. & Matzer M., Pl. Syst. Evol. 192: 31-40 (1994);
Sérusiaux E. & Wessels D., Mycotaxon 19: 479-502 (1984).

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

Thallus: Foliose or fruticose, not subdivided parts, lobed. Upper Surface: Grey or brownish yellow; special structures absent. 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 directly at the tip of the thallus parts, not emerging, stipitate. Margin: Indistinct to distinct; external filaments absent. Exciple: Brown. Periphyses: Absent. Epithecium: Apical cells brown. Interascal Hyphae: Present, scarcely branched to distinctly branched, not or scarcely anastomosed to distinctly anastomosed. Hypothecium: Black or brown.

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

Ascospores: c. 8 per ascus, ellipsoid or ovoid, 10-14 µm long, 7-8 µm wide, obtuse; septa present; transversally septate, 1-transversally septate; wall thin, not thickened at the septum or thickened at the septum, dark brown, in Lugol's Solution negative, wall not ornamented or ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial; immersed, formed along the thallus periphery.

Secondary Metabolites: Present, of the following substance class(es): ß-orcinol depsidones.

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