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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Egea J.M. & Torrente P. (00-03-20); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 2 (A. Aptroot 99-09-27). Llimonaea. Roccellaceae Chevall. (1826); Arthoniales.

Taxonomic Literature: Egea, J.M., Torrente P. & Mies B. Mycotaxon 53: 63-67 (1995); Torrente P. & Egea J.M., Nova Hedwigia 52: 239-245 (1991).

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

Thallus: Crustose, rimose or areolate (primarily areolate). Thallus Outline: Soon disappearing or persistent. Upper Surface: White or brownish yellow; 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 or present:; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

Medulla: Iodine reaction in Lugol's solution negative; reacting violet-red without and distinctly blue with KOH pre-treatment (hemiamyloid).

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid or perithecioid, irregular or linear, forming all across the thallus surface, not emerging, becoming adnate to soon sessile. Margin: Prominent; external filaments absent. Exciple: Dark brown. Periphyses: Absent. Epithecium: Apical cells brown. Hymenium: Iodine reaction: Lugol’s negative, hemiamyloid. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed. Hypothecium: Brown or brownish yellow.

Ascospores: c. 8 per ascus, fusiform, 20-36 µm long, 4-6 µm wide, obtuse or aciculate; septa present; transversally septate, 4-7-(9)-transversally septate; wall thick, distinctly differentiated into primary and secondary wall, not thickened at the septum, dark brown, middle brown, grey, or 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.

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