Affiliation: | Department of Forestry, University of Wisconsin, 1630 Linden Drive, Madison, WI 53706, USA; Department of Forest Resources, University of Minnesota, 1530 N Cleveland Avenue, St Paul, MN 55108, USA; Department of Botany, University of Wisconsin, 430 Lincoln Drive, Madison, WI 53706, USA; To whom correspondence should be addressed.; Present address: Division of Science, Florida Atlantic University, 2912 College Ave., Davie, FL 33314, USA. E-mail: |