Phytologia 28: 480 (1974).

Basionym: Parmelia imshaugii Hale, Phytologia 22, 1: 31 (1971).

Type: Chile, Valparaiso, Montaña Campaña, Imshaug 36670 (MSC - holotype; US - isotype).

Thallus: adnate to loosely adnate on bark, whitish ashy gray, 4-6 mm broad; lobes subirregular, 3-5 mm wide; upper surface plane to rugulose, shiny, maculate, becoming chracked with age, sorediate, the soralia laminal to subapical, diffuse, the soredia farinose; lower surface black except for a brown zone at the tips, moderately to densely rhizinate, the rhizines black, shiny, simple. Apothecia substipitate, ecoronate, 2-4 mm in diameter; spores 8, 4 X 8 µm.

Photobiont: Trebouxia.

Chemistry: Cortex K+ yellow, medulla K+ yellow turning red, C-, KC-, P+ orange, atranorin, salazinic acid.

Ecology: On Nothofagus in open areas.

Molecular data: Genbank

Distribution: Chile.

Note: This species is unlike any other species in the genus because of the production of laminal soredia.