Freshwater filamentous algae are the most diverse and ubiquitous organisms on earth which occupy a myriad of ecological conditions. Manual of Paddy Field Filamentous Algae in Kerala provides a simple, practical and comprehensive guide to the genera of paddy field filamentous algae in Kerala. Images and descriptions given in the book help to identify the algae up to species level. This book is an easy guide for identification of filamentous algae .