1
Biological Science Program, Faculty of Science, Chulalongkorn University, Bangkok 10330, THAILAND 2
Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok 10330, THAILAND
* Corresponding author. E-mail: kidyoo_m@yahoo.co.th
Received: 18 February 2012; Accepted: 6 June 2012