1. Jodrell Laboratory, Royal Botanic Gardens; Kew, Richmond, Surrey TW9 3DS U.K.
2. Department of Botany, University of Florida; Gainesville, Florida 32611 U.S.A.
3. Florida Museum of Natural History, University of Florida; Gainesville, Florida 32611 U.S.A.
4. 829 Pine Hall Road, State College; Pennsylvania 16801-3008 U.S.A.