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Data Set Maintenance: Data set standard item. Data set author(s): Marbach B. 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. Abrothallus (Fluctua). Synonyms: Buellia; Physciaceae Zahlbr. (1898); Lecanorineae; Lecanorales.

Taxonomic Literature: Taxonomic notes: Monophyletic genus. Apothecia with high and bent margin, disco with pruina. As the species of Amandinea Fluctua shows filiform Conidia.The characters of the Apothecia (habitus and chemistry) differ from Amandinea. Marbach B. Corticole/lignicole Arten der Flechtengattung Buellia. - Bibl. Lichenol 74. 1-384 (2000).

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

Thallus: Crustose, not subdivided parts, rimose. Thallus Outline: Soon disappearing. Upper Surface: Grey or white; special structures absent; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by the whole lower surface; special structures absent; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, becoming adnate to soon sessile. Wall: Carbonized only in parts. Margin: Distinct; external filaments absent. Exciple: Black or brown. Periphyses: Absent. Epithecium: Apical cells grey, brown, or brownish yellow. Hymenium: Iodine reaction: Lugol’s positive. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Black or brown.

Asci: Tholus thickened, amyloid, with non-amyloid wide axial body and divergent amyloid flanks towards apex; ocular chamber broad; dehiscence lecanoralean.

Ascospores: c. 8 per ascus, ellipsoid, 11-15-19 µm long, 6-7.5-9 µm wide, obtuse; septa present; transversally septate, 1-1-1-transversally septate, formed by the proper spore wall; wall thickened at the septum, not constricted where the septum meets the spore wall, middle brown, in Lugol's Solution negative, wall ornamented.

Conidiomata: Present or absent resp. not observed; pycnidial; immersed to adnate.

Conidiogeneous Cells: Apical. Conidia: Filiform; microconidial, not branched; aseptate.

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

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