Myxotaxon 26: 453 (1986).

Protolog: Thallus adnatissimus, saxicola, 2-5 cm latus, flavescenti-viridis, lobis angustis sublinearibus, 1-2 mm latis, aetate rugosis, superne planis ad convexis, isidiatus, isidiis ....

Protolog type data: Crater Mountains along route 85, 425 m, Maricopa County, Arizona, United States of America, Nash 6059 (ASU, holotype; ANUC, BM, COLO, DUKE, F, LSU, MIN, NYBG, O and US isotypes).

Type locality: USA, Arizona, Maricopa County, Crater Mountains along route 85, 425 m, T. Nash 6059 (ASU - holotype; ANUC, BM, COLO, DUKE, F, LSU, MIN, NYBG, O, US - isotypes).

Type locality coordinates: 33°30'50?N, 112°28'33?W; 33.513889°, -112.475833°.

Molecular barcode: Data lacking.

Thallus: foliose, adnate to tightly adnate, yellowish green, 2.0-8.0 cm broad; lobes sublinear, contiguous, convex, 0.5-2.5 mm wide; upper surface continuous, isidiate, the isidia developing branches and becoming inflated with darkened tips, occasionally becoming erumpent but not sorediate, 0.1 - 0.3 x 0.1 - 0.8 mm; lower surface plane, pale brown, moderately rhizinate, the rhizines pale brown. Apothecia unknown. Pycnidia unknown (Nash & Elix 1986: 453).

Photobiont: Trebouxia.

Chemistry: Usnic acid, norstictic acid (major), hyposalazinic acid, connorstictic acid constant with the accessory fatty acids, pertusaric acid, constipatic acid, protoconstipatic acid (Nash & Elix 1986: 453).

Ecology: On rock.

Molecular data: Genbank

Distribution: Database

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