1. Department of Plant Biology, University of Minnesota, St Paul, Minnesota 55108
2. Department of Botany, The Zamorin’s Guruvayurappan College, Calicut, Kerala 673014, India
3. Department of Botany, National Museum of Nature and Science, Amakubo 4-1-1, Tsukuba, Ibaraki 305-0005, Japan
4. Biology Department, Clark University, Worcester, Massachusetts 01610