Bryologist 89: 222 (1986).

Basionym: Parmelia ceratophylla var. atrofusca Schaer., Enum. Crit. Lich. Eur.: 42 (1850).

Type locality: Switzerland, in mont. St. Bernhard, 1840, Schaerer (G - lectotype). Lectotypification by Krog, Lichenologist 6: 1138, 1974.

Type locality coordinates: Data lacking.

Molecular barcode: Data lacking.

Thallus: foliose, to 10 cm diam., closely adnate, forming orbicular thalli with few imbricate branches towards the centre, greyish to dark grey with brownish lobe tips; lobes 1-2 mm diam, convex, shiny; lower surface black or brown at the lobe tips. Apothecia frequent, to 10 mm diam.; disc brown, margin sometimes crenulate. Spores broadly ellipsoid, 7-10 x 6-7 µm. Pycnidia frequent. Conidia bifusiform, 5-7 x l µm.

Photobiont: Data lacking.

Chemistry: Cortex C—, K+ yellow, KC-—, PD—; atranorin. Medulla C—, K—, KC+ red, PD+ orange; physodic acid and protocetraric acid.

Ecology: Saxicolous, growing on exposed siliceous rocks, preferably on large boulders.

Molecular data: Genbank

Distribution: Mainly in the high-alpine zone in Norway and Sweden. Also found in Central Europe. Database

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