Thallus obscure grey or fawnish often somewhat reddish-brown, wrinkled-plicate to ± bullate or inflated-subsquamulose, or subareolate-granular, ± diffract, 1-4 cm diam.
Apothecia sessile or innate, black or reddish-black, often red-brown at margins, matt, epruinose, 0.2-2.0 mm diam., solitary or confluent, often crowded, disc plane to subconvex, surface often furrowed, margins thin, brown, or lacking. Epithecium red-brown, 8-14 µm thick. Hymenium pale yellow-brown, 50-65 µm tall. Paraphyses thick, dense, red-brown and capitate, to 5 µm thick at apices. Hypothecium colourless. Ascospores ellipsoid, 8-10 × 4-5 µm.
Chemistry : C–, K+ red, Pd–. Norstictic acid detected by TLC.
Australasia and southern South America (Falkland Islands and Isla de los Estados).
Only the form with innate, concave apothecia (var. concava (Müll. Arg.) Fryday) is known from South America where it is quite frequent. However, Kantvilas & Elix (2007 - Lichenologist 38: 135-141) considered this form to be within the variation of the species and did not afford it any taxonomic rank.
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