1. National Centre for Biosystematics; Natural History Museum, University of Oslo; P.O. Box 1172 Blindern 0318 Oslo Norway
2. Department of Botany; St. Petersburg State University St. Petersburg Russia
3. Tromsø University Museum; University of Tromsø; 9037, Tromsø Norway
4. The University Centre in Svalbard; P.O. Box 156 9171 Longyearbyen