^Acharius, E. (1803). Methodus qua omnes detectos lichenes secundum organa carpomorpha ad genera, species et varietates redigere atque observationibus illustrare tentavit Erik Acharius (Methodus Lichenum). Cum tab. aen (in Latin). Stockholm. p. 20.
^Pentecost, A.; James, P.W. (2009). "Opegrapha Ach. (1853)". In Smith, C.W.; Aptroot, A.; Coppins, B.J.; Fletcher, F.; Gilbert, O.L.; James, P.W.; Wolselely, P.A. (eds.). The Lichens of Great Britain and Ireland (2nd ed.). London: The Natural History Museum. p. 646. ISBN978-0-9540418-8-5.