Mycotaxon 27: 580 (1986).

Synonym: Index Fungorum

Type: South Africa.

Thallus: foliose, adnate, 6-9 cm broad, yellowish green; lobes subirregular to sublinear, 1-2.5 mm wide, contiguous to imbricate; upper surface continuous, emaculate, shiny, becoming strongly transversely cracked toward the center, isidia and soredia lacking; medulla white; lower surface plane, pale brown, moderately to rather densely rhizinate, the rhizines brown, 0.5-1 mm long. Pycnidia common; conidia bifusiform, 0.5 x5-6 µm. Apothecia adnate, 2-4 mm in diameter; spores not developed.

Photobiont: Trebouxia.

Chemistry: Protocetraric acid, pseudostictic acid (unknown K+ deep orange-red compound near stictic acid), usnic acid (det. A. Johnston).

Ecology: On rock.

Molecular data: Genbank

Distribution: Database

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