1. Tromsø Museum, University of Tromsø, NO-9037 Tromsø, Norway
2. Department of Arctic and Marine Biology, Faculty of Biosciences, Fisheries and Economics, University of Tromsø, NO-9037 Tromsø, Norway
3. The University Centre in Svalbard, PO Box 156, NO-9171 Longyearbyen, Norway
4. Museum of Natural History and Archaeology, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
5. Norwegian Institute for Nature Research, PO Box 5685 Sluppen, NO-7485 Trondheim, Norway
6. Institute of Botany, University of Innsbruck, Sternwartestraße 15, A-6020 Innsbruck, Austria
7. Department of Organismic Biology, University of Salzburg, Hellbrunnerstraße 34, A-5020 Salzburg, Austria
8. Centre for Ecological and Evolutionary Synthesis, Department of Biosciences, University of Oslo, PO Box 1066 Blindern, NO-0316 Oslo, Norway
9. National Centre for Biosystematics, Natural History Museum, University of Oslo, PO Box 1172 Blindern, NO-0318 Oslo, Norway