1. Department of Ecology & Evolutionary Biology; Yale University; P. O. Box 208106 New Haven, Connecticut 06520-8106 U. S. A.
2. Department of Palynology & Structural Botany; Faculty Center of Botany and Botanical Garden; University of Vienna; Rennweg 14 1030 Vienna Austria
3. Department of Ecology & Evolutionary Biology; the Peabody Museum of Natural History; Yale University; P. O. Box 208106 New Haven, Connecticut 06520-8106 U. S. A.