1. Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense de Madrid, Madrid 28040 Spain
2. Department of Botany, The Field Museum, 1400 S. Lake Shore Drive, Chicago, Illinois 60605 USA
3. Cryptogamic Botany, Swedish Museum of Natural History, P.O. Box 50007 SE‐104 05 Stockholm, Sweden
4. North Dakota State University, Department of Biological Sciences 2715, PO Box 6050, Stevens Hall, Fargo, North Dakota 58108‐6050 USA