B.  Marbach, ?Corticole und lignicole Arten der Flechtengattung Buellia sensu lato in den Subtropen und Tropen?, Bibliotheca Lichenologica, vol. 74, pp. 1-384, 2002.

J.  Hafellner, ?Additions and corrections to the checklist and bibliography of lichens and lichenicolous fungi of insular Laurimacaronesia II?, Fritschiana, vol. 36, pp. 1-10, 2002.