Kungl.-Akad. Handlingar 7, 4: 92 (1929).
Synonyms: Index Fungorum
Protolog: Data lacking.
Type locality: Peru, near Cuzco, Urubamba valley, Ollantaitambo upland, xx m, 30 August 1960, F. Mattick 701 (B 600011956 - neotype. Typification by K. Knudsen 2006).
Barcode: Data lacking.
Coordinates: 13°15'14?S, 72°15'49?W; -13.253889°, -72.263611°.
Thallus: effigurate, 2-7 cm wide, orbicular to irregular; confluent thalli without clear center or outer edge; center rimose-areolate in orbicular thalli; areoles angular, 0.2-1 mm wide, less than 1 mm thick, broadly attached to the substrate, the outer areoles usually bilobed, rounded, 0.2-0.5 mm wide. Upper surface yellow, matt to glossy, smooth, but becoming striate, and eventually rugulose. Upper cortex, usually thin (30-40 µm thick) but uneven, cells obscure in water or KOH. Algal layer discontinuous and jagged, divided by hyphal bands. Apothecia usually one to eight per areole towards the center of orbicular thalli; disc immersed, yellow to a pale red-brown, flat, rough, epruinose, 0.1-0.6 mm wide, sometimes with an umbo.Hymenium hyaline, 150-200 µm high. Epihymenium, pale yellow to reddish-yellow. Parathecium narrow to very indistinct. Paraphyses ca. 1.0-1.5 wide at mid-level, apices not expanded, in yellow to reddish pigmented gel. Asci 80-100 x 20-30 µm, clavate; ascospores 100 per ascus, narrow ellipsoid, 4-5 x 2 µm (Knudsen et al. 2008: 4). Pycnidia unknown.
Photobiont: Trebouxioid green alga.
Chemistry: Rhizocarpic acid (major), traces of epanorin and conrhizocarpic acid (Knudsen et al. 2008: 4).
Ecology: On volcanic and acid rocks above 500 m elevation, reported also from calcareous rock (Magnusson 1929).
Molecular data: Genbank
Distribution: Argentina, Bolivia and Peru. Database
Note:
Peru: Hochfläche von Ollantaitambo (Urubambatal) bei Cuzco, F. Mattich 701 (B - neotype designated by Knudsen et al. 2008: 4).