In this book, all the cyanobacteria reported by various phycologists so far from didderent places of Nepal have been incorporated and presented systematically. The text covers the morphology, habitat and distribution with illustrations of all the cyanobacteria in details, useing the recently developed molecular based polyphasicapproach of classification. This is the first book ever written in the history of algal flora of Nepal that explores the specieswith illustrations in detail. This book can be very useful for algae researchers, specially in identifyng cyanobacteria.