Synonymy:
Parmelia phaea Tuck. ex E. Michener, in Darlington, Fl. Cestrica, Edn 3 (Philadelphia): 440 (1853)
Physcia aipolia subsp. phaea (Tuck. ex E. Michener) Clauzade & Cl. Roux, Bull. Soc. bot. Centre-Ouest, Nouv. sér., num. spec. 7: 827 (1985)

Physcia callosa Nyl., Flora, Regensburg 52: 119 (1869)

Position in classification:
Physcia, Physciaceae, Caliciales, Lecanoromycetidae, Lecanoromycetes, Ascomycota, Fungi

Note:
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