in Hertel, Beih. Nova Hedwigia 79: 437 (1984).
Basionym: Lecidea cinereoatra Ach., Lich. Univ.: 167 (1810).
Thallus: Data lacking. Apothecia innate, exciple dark. Paraphyses richly branched and anastomosing, conglutinate
Photobiont: Data lacking.
Chemistry: Confluentic acid (major constituent), 2'-O-methylperlatolic acid, 2'-O-methylmicrophyllinic acid; olivetonide monomethyl ether and unidentified substances often visible on heavily spotted TLC plates; SV-1 and triterpenes also sometimes present (Gowan 1989: 40). - Confluentic acid (Fryday 2005: 5).
Ecology: HCl- rocks, usually exposed and unshaded.
Distribution type: Western (Gowan 1989: 40), Eastern North America and Europe (Knoph 1984).