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Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Tehler A. (95-11-27) and Scholz P. (02-05-16); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 30. Roccella. Synonyms: Reinkella Darb. (1897); Roccellaceae Chevall. (1826); Arthoniales.

Taxonomic Literature: Clauzade G. & Roux C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero

Special 7: 1-893 [696-697] (1985); Purvis O.W. in: Purvis O.W. et
al.
(eds), The Lichen Flora of Great Britain and Ireland, London
(1992);
Tehler A., Can. J. Bot. 68: 2458-2492 (1990); Tehler A. in:
Nash T.H. III et al. (eds) Lichen Flora of the Greater Sonoran Desert
Region vol. 1, 451-454, Tempe (2002).

Biogeography: Checklist records: Great Britain, Italy, Sonoran Desert, Thailand, United States and Canada (continental), Namibia, and Republic of South Africa.

Ecology: Biotroph; lichenized; corticolous; substrate non-calciferous or calciferous.

Lichen Photobionts: Primary photobiont present; trentepohlioid. Primary photobiont taxonomy: Trentepohlia (A. Beck 22-05-97); Trentepohliaceae; Trentepohliales, Ulvophyceae, Eukariota. Secondary photobiont absent.

Thallus: Fruticose, not subdivided parts. Upper Surface: Grey or greyish brown; special structures absent or present:; not pseudocyphellate; eciliate; without hairs; not isidate; not sorediate or sorediate; not cephalodiate; not lobulate or lobulate; without granules granules, without thalloconidia thalloconidia. 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 all across the thallus surface, directly at the tip of the thallus parts, not emerging, soon sessile or stipitate. Margin: Indistinct, distinct, or prominent. Exciple: White. Epithecium: Apical cells black or brown. Interascal Hyphae: Present, distinctly branched, not or scarcely anastomosed or distinctly anastomosed. Hypothecium: Black or brown.

Ascospores: c. 8 per ascus, oblong-obtuse, curved, or fusiform, 14-30 µm long, 4-6 µm wide; septa present; transversally septate, 3-transversally septate; wall thin, not thickened at the septum, hyaline or pale brown, in Lugol's Solution negative, wall not ornamented.

Secondary Metabolites: Present, of the following substance class(es): orcinol depsides, ß-orcinol depsides, or (higher) aliphatic acids.

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