1. Department of Plant Biology, University of New Hampshire, Durham, New Hampshire 03824 (P.B., B.M.G., S.K.B., S.C.M.);
2. U.S. Department of Agriculture Forest Service, Northeastern Experiment Station, P.O. Box 640, Durham, New Hampshire 03824 (S.L.L., R.M.); and
3. New Zealand Forestry, Private Bag 2030, Rotorua, New Zealand (C.W.)