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The state of Tripura is one of the richest and interesting botanical regions in North East India, which is floristically in completely known. The present work is the outcome of comprehensive survey and study of Pteridophytic plants by the author for a period of 10 years. The area covered the present flora is 10,491 sq. km, lying between 22-32 N and 24-32 and 91-10 and 92-21 E. The author have enumerated 76 species under 41 genera and 28 families according to Pichi Sermolli's systems of classification. Correct description based on careful study of freshly collected plants, its currently accepted botanical name, synonyms, if any, brief ecological notes, and distribution are given for each species anatomical details of each species is a special attraction of this book. Almost all the species have been illustrated. Artificial keys for identifications of families, genera and species under each family are given. The introductory account includes all about the area of study, climate, soils, previous botanical exploration of the area, ecological observation etc. of the Ferns and Ferns-Allies. On the whole this book serves as a guide to the identification of Pteridophytic plants of the state of Tripura, North-East India.