1. Department of Higher Plant Systematics and Evolution; Institute of Botany, University of Vienna; Jodrell Laboratory; Rennweg 14 A-1030 Viennaa Austria
2. Jodrell Laboratory; Royal Botanic Gardens, Richmond, Surrey TW9 3DS U.K.
3. Departamento de Botánica; Universidad de Salamanca; E-37007 Salamanca Spain