Malpighia 20: 10 (1906).

Basionym: Lecanora xanthophana Nyl., Annls Sci. Nat., Bot., Sér. 4 15: 379 (1861).

Synonyms: Index Fungorum

Protolog: Data lacking.

Type locality: Data lacking.

Barcode: Data lacking.

Coordinates: Data lacking.

Thallus: areolate to subsquamulose, dispersed or contiguous, to 4 cm wide. Areoles irregular to sublobate, 0.5-2.0 mm wide, 0.5-1.5 mm thick, subdividing vegetatively, broadly attached, becoming elevated; underside of the down-turned or lobed rim narrow, usually whitish. Upper surface yellow, dull, smooth but becoming cracked or fissured, often rugulose, epruinose. Upper cortex varying thickness, from very narrow to 30-100 µm, with distinct upper syncortex, hyphae obscure in water or KOH, paraplectenchymatous to prosoplenthenchymatous, cells various. Algal layer interrupted by broad hyphal bands in thick specimens. Apothecia many per areole; disc punctiform, yellow to brown, 0.1-0.4 mm wide, sometimes surrounded by a slightly elevated parathecial crown concolorous with the thallus. Hymenium 130-200 µm high, the upper portion yellowish, the lower hyaline. Epihymenium yellow. Paraphyses slender, ca. 1.5 µm diam. at mid-level, apices not expanded. Asci 100-140 x 15-25 µm, narrowly clavate; ascospores 100-200 per ascus, narrowly ellipsoid, 3-5 x 1.5-2 µm. Pycnidia abundant, conidia ellipsoid, ca. 2 x 1.5 µm (Knudsen et al. 2008: 12).

Photobiont: Trebouxioid green alga.

Chemistry: Spot tests negative. Epanorin (major or minor or trace) and/or rhizocarpic acid (major or minor), sometimes traces of conepanorin (Knudsen et al. 2008: 12).

Ecology: Usually on exposed volcanic and acid rocks above 2000 meters elevation Also near sea level on Isla Más a Tierra, Juan Fernandez Islands (Knudsen et al. 2008: 12).

Molecular data: Genbank

Distribution: Database

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