We thank the Ministry of Environment and Forests, Government of India and Indian Institute of Science for the infrastructure support and sustained financial support for ecological research. We are also grateful to Dr. Jonathan Taylor and Dr. J.P. Kociolek for confirming the identity of species.  Dr. P Pramod and Mr.Joseph Reginald from SACON, Coimbatore provided useful tips during field investigations. We thank Institute Nanoscience Initiative (INI) for permitting us to use SEM facility and INI staff for their help and support.