Basionym Name:Rhizoplaca haydenii subsp. arbuscula Rosentr., in McCune & Rosentreter, Monogr. N. Am. Lichenol. 1: 91 (2007)
Homotypic synonyms:Rhizoplaca arbuscula (Rosentr.) Rosentr., St. Clair & Leavitt, in Leavitt, Keuler, Newberry, Rosentreter & Clair, Plant and Fungal Systematics 64(2): 242 (2019)