1. Gyalecta canariensis sp. nov., a new lichen (Ascomycota) described from La Palma (Canary Islands);van den Boom;Mycotaxon,2005
2. New records of lichens and lichenicolous fungi from Fuerteventura (Canary Islands), with descriptions of some new species;van den Boom;Cryptogamie, Mycologie,2006
3. Sipman H. J. M. (2006) Compiled identification key to the genus Pertusaria and some confusable taxa in Europe and the Mediterranean. Botanischer Garten und Botanisches Museum Berlin-Dahlem, Freie Universität Berlin. http://www.bgbm.org/sipman/keys/Perteuro.htm
4. New or interesting saxicolous Pertusaria species (Pertusariales: Pertusariaceae) from Zimbabwe