Institution: | (1) Institute of Plant Sciences, University of Bern, Altenbergrain 21, Bern, 3013, Switzerland;(2) Department of Plant and Animal Sciences, University of Buea, P. O. Box 63, Buea, SW Province, Cameroun;(3) Present address: Department of Entomology, Cornell University, Ithaca, NY 14853, USA;(4) Present address: Herbarium, Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AB, UK |