Basionym Name:Parmelia stygia var. reagens Servít, Hedwigia 50(2): 77 (1910)
Homotypic synonyms:Melanelia stygia var. reagens (Servít) Oxner, Flora Lischaĭnikiv Ukraïni (Kiev) 2(2): 123 (1993)Parmelia reagens (Servít) Gyeln., Feddes Repert. Spec. Nov. Regni veg. 29: 288 (1931)Parmelia reagens f. reagens (Servít) Gyeln., Feddes Repert. Spec. Nov. Regni veg. 29: 288 (1931)