Basionym Name:Parmelia prolixa var. isidiascens Nyl. ex Cromb., Monogr. Lich. Brit.(1): 254 (1894)
Homotypic synonyms:Parmelia delisei var. isidiascens (Nyl. ex Cromb.) Zahlbr., Cat. Lich. Univers. 6: 82 (1929)Parmelia prolixa f. isidiascens (Nyl. ex Cromb.) Zahlbr., Cat. Lich. Univers. 6: 82 (1930)