Kuettlingeria fuscoatroides (J. Steiner) V. Frolov, Vondrák et Arup Taxon méditerranéen.

     Thallus crustose, thin, more or less cracked and aerolate, marginal areoles subsquamulous, greyish, blackish, quite dark, black prothallus sometimes present. Apothecia generally numerous, 0.5-1.5 mm in diameter, flat disc, ferruginous red becoming darker and greyish in old age, persistent edge, concolourous or slightly lighter. Spores polarilocular, colourless, 13-18 x 7-10 µm with an equatorial thickening of 4-8 µm. Pycnidia numerous, black. Pycnidiospores 3-4 µm. Photobiont: green alga other than Trentepohlia. Thallus: C-, K-, KC-, P-; apothecia: C+ purple. Saxicolous species with Mediterranean and coastal tendencies coming to the seaside on well-exposed siliceous rocks.

Cf. Blastenia crenularia whose apothecia are C-.

_ Kuettlingeria neotaurica has a thicker thallus but can only be separated with certainty by chemical analysis.