Basionym Name:Lecanactis ostrearum Vain., in Hiern, Cat. Afr. Pl. 2(2): 430 (1901)
Homotypic synonyms:Arthoniactis ostrearum (Vain.) C.W. Dodge, Nova Hedwigia 12(3+4): 325 (1967)Collemopsidium ostrearum (Vain.) F. Mohr, in Mohr, Ekman & Heegaard, Mycol. Res. 108(5): 530 (2004)