Basionym Name:Opegrapha abnormis Ach., Lich. Univ.: 259 (1810)
Homotypic synonyms:Arthonia abnormis (Ach.) Nyl., Acta Soc. Sci. fenn. 7(2): 483 (1863)Arthothelium abnorme (Ach.) Müll. Arg., Flora, Regensburg 63: 287 (1880)Arthothelium abnorme f. abnorme (Ach.) Müll. Arg., Flora, Regensburg 63: 287 (1880)