Basionym Name:Placodium concrescens Müll. Arg., Bull. Herb. Boissier 1: 130 (1893)
Homotypic synonyms:Lecanora concrescens (Müll. Arg.) Zahlbr., Cat. Lich. Univers. 5: 612 (1928)Squamarina concrescens (Müll. Arg.) Poelt, Mitt. bot. StSamml., Münch. 19-20: 532 (1958)Squamarina concrescens subsp. concrescens (Müll. Arg.) Poelt, Mitt. bot. StSamml., Münch. 19-20: 532 (1958)Squamarina concrescens var. concrescens (Müll. Arg.) Poelt, Mitt. bot. StSamml., Münch. 19-20: 532 (1958)