Homotypic Synonyms See Note

Basionym Name:
Placodium regale Vain., Résult. Voy. Belgica, Lich.: 23 (1903)

Homotypic synonyms:
Caloplaca regalis (Vain.) Zahlbr., Cat. Lich. Univers. 7: 274 (1931)
Caloplaca regalis f. regalis (Vain.) Zahlbr., Cat. Lich. Univers. 7: 274 (1931)
Gondwania regalis (Vain.) Søchting, Frödén & Arup, in Arup, Søchting & Frödén, Nordic Jl Bot. 31(1): 47 (2013)
Polycauliona regalis (Vain.) Hue, Expédit. Antarct. Franç.: 8 (1908)
Polycauliona regalis f. regalis (Vain.) Hue, Bull. Soc. linn. Normandie, sér. 6 1: 89 (1908)
Thamnolia regalis (Vain.) Gyeln., Acta Faun. Fl. Univers., Ser. 2, Bot. 1(nos 5-6): 10 (1933)
Thamnonoma regalis (Vain.) Gyeln., Acta Faun. Fl. Univers., Ser. 2, Bot. 1(5-6): 10 (1933)