Usha Pandey a, J. Pandey b,*
a Faculty of Science and Technology, M. G. Kashividyapith, Varanasi 221 005, India
b Center of Advanced Study in Botany, Banaras Hindu University, Varanasi 221 005, India
Received 11 July 2007; received in revised form 20 August 2007; accepted 21 August 2007
Available online 4 October 2007