1. Palaeobotany and Palynology Laboratory, Department of Botany Sidho‐Kanho‐Birsha University Ranchi Road Purulia 723104 India
2. Presidency University Calcutta University Road, 86/1, College Street Kolkata West Bengal 70073 India
3. Centre of Advanced Study, Department of Botany University of Calcutta 35 B.C. Road Kolkata 700019 India