Basionym Name:Arthonia spadicea C. Knight, Trans. Proc. N.Z. Inst. 15: 353, tab. XXXV, fig. 3 (1883)
Homotypic synonyms:Arthothelium spadiceum Müll. Arg., Bull. Soc. R. Bot. Belg. 31(no. 2): 37 (1892)