1. Department of Pharmaceutical Sciences ‘A’ , Laboratory of Botany, Cryptogamy and Plant Biology , Faculty of Pharmacy of Monastir (University of Monastir) , Monastir , Tunisia .
2. Department of Forestry , Laboratory of Forest Ecology, National Research Institute of Rural Engineering, Water and Forests , IRESA (University of Carthage) Ariana , Tunisia .
3. Department of Environmental Biology , University of Rome Sapienza , Rome , Italy .