Mycotaxon 28, 2: 290 (1987).

Type: Argentina, Province of Buenos Aires, Sierra de la Ventana, Partido Tornquist, Nash 23878 (ASU - holotype; ANUC - isotype).

Thallus: adnate on rocks, up to 6 cm broad, yellow green; lobes subirregular, 1,5-3 mm wide, separate to imbricate; upper surface continuous, emaculate, shiny, moderately to densely isidiate, the isidia globose or short- cylindrical at first, 0,1-0,2 mm in diameter, to 0,7 mm high,in part erumpent and subsorediate at maturity, unbranched; medulla white; lower surface plane, black, shiny, sparsely to moderately rhizinate, the rhizines black, stout, simple, 0,3-0,5 mm long. Pycnidia lacking. Apothecia rare, to 4 mm in diameter; spores 4-6 x 8-10 µm.

Photobiont: Trebouxia.

Chemistry: Stictic acid, constictic acid, norstictic acid, cryptostictic acid (trace), hypostictic acid (trace), connorstictic acid (trace), and usnic acid.

Ecology: On rocks.

Molecular data: Genbank

Distribution: Venezuela, Argentina, A related species in the Andes Mountains. Database

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