The Pteridophytes, consisting of ferns and fern allies, constitute a vast group of vascular cryptogams, the majority of them being restricted to sheltered, shaded humid habitat. Among these, the group of ferns is the most predominant all over the world. The Indian sub-continent is one of the richest in its Pteridophytic flora as regards the variety and abundance with over 1200 species. The taxonomy and nomenclature had undergone such radical changes that it was considered necessary to study the taxonomy and nomenclature of Indian filicineae, as also their reproductive biology, distribution, ecology , palynology and some aspects of experimental studies including ornamental horticulture. The investigations, covering over 75 genera and 350 species mainly of Homosporous Ferns, were objective of studying the occurrence and distribution of ferns in the country. The group has initiated the work on genetic diversity and biosystematics (which also includes molecular characterization) of arsenic and mercury hyper accumulating fern and fern ally i.e. Pteris vittata and Equisetum, respectively.....
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