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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.; revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: genus. Number of known taxa within this rank: 12. Cresponea. Roccellaceae Chevall. (1826); Arthoniales.

Taxonomic Literature: Egea J.M. & Torrente P., Mycotaxon 48: 301-331 (1993); Egea J.M., Sériusiaux E. & Torrente P., Mycotaxon 59: 47-59 (1996).

Biogeography: Checklist records: Germany, Guianas, Italy, New Guinea, Sonoran Desert, Thailand, and United States and Canada (continental).

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

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

Thallus: Indistinct or crustose, not subdivided parts, granular, rimose, or areolate (primarily areolate). Thallus Outline: Soon disappearing or persistent. Upper Surface: Grey, green, 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 or present:; not pseudocyphellate; not cyphellate; not rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, forming all across the thallus surface, soon sessile. Margin: Prominent; external filaments absent. Exciple: Black or dark brown. Epithecium: Apical cells black or brown. Hymenium: Iodine reaction: Lugol’s negative or Lugol’s positive, hemiamyloid. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: White or brownish yellow.

Asci: Tholus thickened, amyloid, entirely amyloid throughout; ocular chamber indistinct; dehiscence bitunicate.

Ascospores: c. 8 per ascus, fusiform, filiform, or oblong-obtuse, 11-85 µm long, 3-9 µm wide, obtuse or aciculate; septa present; transversally septate, 3-19-transversally septate; wall thin, not thickened at the septum, hyaline or pale brown, in Lugol's Solution negative, wall not ornamented.

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

Conidiogeneous Cells: Apical. Conidia: Bacilliform; not branched; aseptate; cell wall hyaline.

Secondary Metabolites: Not detected or present, of the following substance class(es): orcinol depsides.

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