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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Tibell L. (98-02-23); revised; to be published after submission.

Nomenclature: Current taxonomic status: basionymous or accepted. Taxonomic rank: genus. Number of known taxa within this rank: 1. Acroscyphus. Caliciaceae Chevall. (1826); family of unknown placement (incertae sedis); of unknown placement (incertae sedis).

Taxonomic Literature: Tibell L., Beih. Nova Hedwigia 79: 597-713 (1984); Tibell L., Symb. Bot. Ups. 32(1): 291-322 [295-296] (1987).

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

Thallus: Crustose or foliose, not subdivided parts, subfruticose (dactyliform). Upper Surface: 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 the whole lower surface; 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 thallus margin, not emerging, stipitate. Margin: Indistinct; external filaments absent. Exciple: Green. Periphyses: Absent. Hymenium: Mazaedioid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Black.

Ascospores: c. 8 per ascus, ellipsoid or broadly ellipsoid, 32-35 µm long, 13-16 µm wide, obtuse; septa present; transversally septate, 1-transversally septate; wall thin or thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, dark 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, ß-orcinol depsides, (tri-)terpenoids, (anthra-)quinones, pulvinic acid derivatives, and dibenzofurans [and usnic acids].

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