1. Institute of Systematic Botany; University of Zurich; Switzerland
2. Department of Biochemistry; University of Stellenbosch; Private Bag X1 Stellenbosch South Africa
3. Imperial College London; Division of Biology; Silwood Park Campus Ascot, Berkshire U. K.
4. Gothenburg Botanical Garden; Carl Skottsbergs gata 22A Göteborg Sweden
5. Botany Department; Trinity College; Dublin Republic of Ireland