in Divakar, Del-Prado, Lumbsch, Wedin, Esslinger, Leavitt & Crespo, Am. J. Bot. 99, 12: 2023 (2012).

Basionym: Parmelia olivacea var. panniformis Nyl., Herb. Mus. Fenn.: 83 (1859).

Protolog: Data lacking.

Protolog type data: Data lacking.

Type locality: Sweden, ad Holmiam (Stockholm), 1852, Nylander (H-NYL p. m. 1774 - holotype).

Type locality coordinates: Data lacking.

Molecular barcode: Data lacking.

Thallus: to 10 cm diam., appressed, usually panniform, moderately to loosely adnate. Lobes to 1.5 mm wide, flat, somewhat elongate and imbricate. Upper surface moderately to dark olivaceous or reddish brown occasionally with a white pruina on the lobe ends, rarely sorediate, central parts more or less hidden by numerous, isidia-like, elongate to finger-like, simple or branched lobules which arise along the margins of the primary lobes; psudocyphellae lacking. Lower surface black, paler towards the margin; rhizines scattered, concolorous with the lower surface. Apothecia infrequent, sessile, with knobby margins, to 3 mm diam. Spores ellipsoid, 9- l1.5 x 4.5- 7 μm. Pycnidia common. Conidia dumbbell-shaped, 5- 7 x 1 μm.

Chemistry: Cortex HNO3-. Medulla C-, K-, KC-, rarely KC+ rose, PD-; perlatolic and stenosporic acids.

Habitat: Saxicolous, on siliceous stones and boulders.

Distribution: Scattered to common in the Nordic countries except Denmark. Circumpolar, arctic to temperate, also South America.