Acta Fauna Fl. Universali, Ser. 2, Bot. 1(5-6): 6 (1933).
Basionym: Cetraria ciliaris Ach., Lichenogr. Universalis: 508 (1810).
Synonym: Index Fungorum
Type: USA, "America borealis", Mühlenberg (H-ACH 1511 - lectotype, Culberson & Culberson, Bryologist 70: 159, 1970, as holotype).
Chemistry:
Ecology: Exclusively on trunks and branches of Betula in the Nordic countries, elsewhere also on conifers and other trees (Ahti & Thell 2011: 106).
Molecular data: Genbank
Distribution: Database
Note:
Race I: Cortex C-, K+ yellow, KC-, PD-; atranorin. Medulla C+ red, K-, KC+ red, PD-, UV-; olivetoric and physodic acids (Ahti & Thell 2011: 106).
Race II: Cortex C-, K+ yellow, KC-, PD-; sometimes atranorin. Medulla C-, K-, KC+ orange to pink, PD-, UV+ bluish white; alectoronic acid, sometimes also alpha-collatolic acid (Ahti & Thell 2011: 106).