1. Birbal Sahni Institute of Palaeosciences (BSIP), Lucknow, Uttar Pradesh, India
2. Central Regional Centre, Botanical Survey of India (BSI), Allahabad, Uttar Pradesh, India
3. Botanical Survey of India (BSI), Kolkata, West Bengal, India
4. CSIR-National Botanical Research Institute, Lucknow, Uttar Pradesh, India