Arctocetraria nigricascens (Nyl.) Kärnefelt & A. Thell

Bryologist 96: 402 (1993).

Basionym: Platysma nigricascens Nyl. in Kihlman, Meddeland. Soc. Fauna Fl. Fenn. 18: 50 (1891).


Synonyms: Index Fungorum

Protolog: Data lacking.
Type locality: Data lacking.
Barcode: Available. AF254628.
Coordinates: Data lacking.


Thallus: foliose, erect, dichotomously branched, to 5 cm high. Lobes to 6 mm wide, pale olivaceous grey to blackish, weakly canaliculate, somewhat wrinkled or smooth, glossy or dull. Marginal lobules sometimes present. Soralia very rare, laminal, irregular, close to lobe tips, to 1 mm diam. Pseudocyphellae rarely present, preferably on the lower surface, punctiform, to 0.2 mm diam. Marginal projections sparse, to 0.5 mm long. Marginal cilia rather common, to 3.5 mm long. Apothecia submarginal at lobe ends, sparse, to 8 mm diam.; disc usually blackish. Spores broadly ellipsoid, 6- 8.5 x 3.5- 4.5 μ. Pvcnidia at ends of marginal projections. Pycnicia dumbbell-shaped, 4- 5.5 x 1 μ.

Photobiont: Data lacking.

Chemistry: Cortex C-, K—, KC—, PD—. Medulla C-, K-, KC—, PD—; rangiformic and norrangiforrnic acids.

Ecology: Grows both on twigs of dwarf bushes and soil in arctic tundra heaths.

Molecular data: Genbank

Distribution: Known from single occurrences in Greenland and Svalbard. High to low arctic-circumpolar distribution from Svalbard to Queen Elizabeth Islands and Franz Josef Land. Database