Nordic J. Bot. 2, 3: 291 (1982).

Basionym: Parmelia reddenda Stirt., Scott. Natural. 4: 298 (1878) [1877-78].

Protolog: Similis P. Borreri sed medulla C- vel K- C-. Thallus subtus niger ambitu spadiceus rugosulus rhizinosus, rhizinis nigris, nigricantibus vel etiam interdum pallidis. Sterilis.

Protolog type data: Prope New Galloway Scotiae, a J. M. Andrew lecta.

Type locality: United Kingdom, Scottland, Council Area Dumfries and Galloway, near New Galloway, J. M. Andrew (xxx - xxx).