Type locality coordinates: Data lacking.

ITS barcode: Data lacking.

Description: Lichen. Thallus appressed and closely adnate, to 15 cm diam. Lobes to 5 mm wide, irregularly shaped, discrete to fabricate, slightly raised at margins, not eroded and swo1len; upper surface olive-brown, wrinkled, dull to shiny at the margins, often somewhat pruinose, ?at to somewhat convex; with laminal, punctiform pseudocyphellae; without isidia and soredia; lower surface dark brown, paler towards the margins; rhizines concolorus with the lower surface, rather frequent. Apothecia common, sessile, to 9 mm diam., margins with pseudocyphellae. Spores 12-17 x 7- 11 μm. Pycnidia common. Conidia more or less dumbbell-shaped, c. 8 x 1 μm.

Photobiont: Data lacking.

Chemistry: Cortex C—, K—, KC—, PD—. Medulla C—, K—, rarely K+ yellow, KC—, PD+ orange, rarely PD-; fumarprotocetratic acid, rarely without secondary substances (by TLC).

Ecology: Frequent on bark, preferably on Betula, rarely also on rock. Most abundant in mountain birch forests near the timberline, absent below the average winter snow cover.

Distribution type: Incompletely circumpolar in the Northern Hemisphere: Northern Europe, Russia, Japan, Alaska, central Canada and northeastem North America. Scattered in the entire Fennoscandia, but rare in the south and especially common in the subalpine Betula zone.

Taxonomy: Data lacking.

Note:

--> Distribution Database: Distributions

Distribution Database: Discover Life

Picture Database: Tropical Lichens

Molecular Database: Genbank

Synonym Database: Index Fungorum

Synonym Database: Mycobank