Basionym Name:Parmelia spissa Brusse, Mycotaxon 31(1): 158 (1988)
Homotypic synonyms:Karoowia spissa (Brusse) Hale, Mycotaxon 35(1): 190 (1989)Xanthoparmelia spissa (Brusse) G. Amo, A. Crespo, Elix & Lumbsch, Aust. Syst. Bot. 23(3): 182 (2010)