Act. Soc. Linn. Bordeaux 21: 272 (1856). in Nordic Lichen Flora Vol. 3 "(1857)" .

Basionym: Lichen saturninus Dicks., Fasc. Pl. Crypt. Brit. (London) 2: 21 (1790). In Nordic Lichen Flora Vol. 3 page "22".

Type locality coordinates: Data lacking.

Molecular barcode: Data lacking.

Thallus: foliose, often orbicular, to 8 cm diam., lobes regularly rounded, to 2 cm wide, 150-250 µm thick, often orbucular; upper surface olivaceous grey-brown, usually appearing darker due to the numerous, blackish, granular to shortly cylindrical, laminal isidia; lower surface paler, covered with white tomental hairs, to 100 µm long with cylindrical cells. Apothecia very rare, to 2 mm diam., with isidiate margin, brownish. Spores colourless, submuriform, ellipsoid, 20-25 x 8-10 µm. Conidiomata unknown (Jørgensen 2012: 39).

Photobiont: Nostoc, in clusters, individual cells 4-6 µm (Jørgensen 2012: 39).

Chemistry: No lichen substances, by TLC (Jørgensen 2012: 39).

Ecology: Corticolous, mainly on coarse-barked trees, such as Populus and Salix, more rarely on mossy calcareous rocks and soil, e.g. Dryas heaths in mountains (Jørgensen 2012: 39 on nordic localities).

Distribution type: Widespread in cool-temperate pars of the Northern Hemisphere (Jørgensen 2012: 39).

Taxonomy: Data lacking.

Note:

Distribution Database: Distributions

Picture Database: Tropical Lichens

Molecular Database: Genbank

Synonym Database: Index Fungorum