1. National Centre for Biosystematics, Natural History Museum, University of Oslo
P.O. Box 1172 Blindern, NO-0318, Oslo, Norway E-mail: christian.brochmann@nhm.uio.no (C.B.)
2. Department of Systematic Botany, Evolutionary Biology Centre, Uppsala University
SE-752 36, Uppsala, Sweden E-mail: bengt.oxelman@ebc.uu.se
3. School of Computing Sciences, University of East Anglia
Norwich, NR4 7TJ, United Kingdom
katharina.huber@cmp.uea.ac.uk(K.T.H.) vincent.moulton@cmp.uea.ac.uk (V.M.)