1. Department of Biology, Higher Teachers Training College, The University of Bamenda, Bamenda, Cameroon
2. Wastewater Research Unit, Department of Plant Biology, Faculty of Science, The University of Yaoundé I, Yaounde, Cameroon
3. Department of Hydraulics and Water Management, National Higher Polytechnic Institute, University of Maroua, Maroua, Cameroon
4. Laboratory of Applied Botany, Department of Plant Biology, University of Dschang, Dschang, Cameroon