1. Westerdijk Fungal Biodiversity Institute, Uppsalalaan 8, 3584 Utrecht, The Netherlands
2. Faculty of Natural and Agricultural Sciences, Department of Plant Sciences, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa
3. Microbiology, Department of Biology, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands