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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Kasalicky T. (98-03-17); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 15. Letrouitia. Letrouitiaceae Bellem. & Hafellner (1982); Teloschistineae; Lecanorales.

Taxonomic Literature: Awasthi D.D. & Srivastava P., Proc. Indian Acad. Sci. (Pl. Sci.) 99: 165-177 (1989); Hafellner J., Nova Hedwigia 35: 645-729 (1981).

Biogeography: Checklist records: United States and Canada (continental), Guianas, Thailand, New Guinea, and Bolivia.

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

Thallus: Crustose, not subdivided parts, rimose. Upper Surface: Grey, brownish yellow, orange, or white; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate or isidiate; not sorediate or 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 all across the thallus surface, soon sessile. Margin: Prominent; external filaments absent. Exciple: White. Periphyses: Absent. Epithecium: Apical cells orange. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White or brownish yellow.

Asci: Tholus thickened, amyloid, entirely amyloid throughout; dehiscence lecanoralean.

Ascospores: 1–2 to c. 8 per ascus, ellipsoid, broadly ellipsoid, oblong, cylindrical, or fusiform, 11-50-(58) µm long, 5-21 µm wide, obtuse; septa present; transversally septate or both transversally and longitudinally, 3-11-transversally septate; wall thin or thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial; formed all accross the thallus surface.

Secondary Metabolites: Present, of the following substance class(es): (anthra-)quinones.

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