Affiliation: | Departamento de Botânica/CCB, Universidade Federal de Pernambuco, Rua Prof. Nelson Chaves s/n, Recife, PE, CEP 50372-970, Brazil,;Département de biologie, Universitéde Sherbrooke, Sherbrooke, Quebec J1K 2R, Canada,;Department of Biology, University of Ottawa, 30 Marie Curie, Ottawa, Ontario K1N 6 N5, Canada |