1. Swedish Univ. of Agricultural Sciences; Dep. of Plant Biology; Box 7080 SE-750 07 Uppsala Sweden
2. Norwegian Univ. of Science and Technology; Dep. of Biology; N-7491 Trondheim Norway
3. IFM-Biology, Linköping Univ.; SE-581 83 Linköping Sweden
4. Swedish Museum of Cultural History; SE-643 98 Julita Sweden