1. Institut de Systématique, Évolution, Biodiversité (ISYEB), Muséum national d'Histoire naturelle; Paris France
2. Department of Plant Taxonomy and Nature Conservation; University of Gdansk; Poland
3. Department of Microbiology, Laboratory of Mycorrhizal Association; Universidade Federal de Viçosa; Brazil
4. Zurich-Basel Plant Science Center, Department of Environmental Sciences, Botany; University of Basel; Switzerland
5. Department of Biology; University of Fribourg; Switzerland