Meddn Soc. Fauna Flora Fenn. 13: 40 (1886).
Type locality: Finland, Hogland, Brenner s.n. (H-NYL 34916 - lectotype).
Thallus: foliose, adnate to loosely adnate, very fragile and brittle, dark to blackish brown, 4 - 8 cm broad; lobes sublinear, short and imbricate, 1 - 3 mm wide, usually developing small secondary lobes with age; upper surface plane to weakly foveolate, shiny, continuous, sparsely cracked with age, pseudocyphellae mostly marginal but a few also laminal on older lobes, small, 0.2 - 0.5 mm long, effigurate and coalescing at times to form a loose, mostly marginal reticulate network; lower surface black, sparsely to moderately rhizinate, the rhizines simple to furcate, 1 - 1.5 mm long. Pycnidia not common, conidia cylindrical, straight to slightly bent, 5.5 - 6.5 µm long. Apothecia rather rare, adnate to substipitate, 2 - 5 mm in diameter, the amphithecium pseudocyphellate reticulate, the disc plane, hymenium 55 - 60 µm, spores 8 - 10 / 14 - 16 µm, the episporium 1.5 - 2 µm thick (Hale 1987: 23).
Photobiont: Green alga.
Chemistry: Atranorin, protocetraric acid, and lobaric acid (Culberson 1970), with accessory substances galbinic acid, fumarprotocetraric acid and unidentified fatty acids (Skult 1984).
Ecology: On silicious stone.
Distribution type: Data lacking.
Taxonomy: Data lacking.
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