Synopsis The present volume is compendium of wide ranging topics on applied and commercial aspects of algae.  It is an assemblage of the up-to-date information of rapid advances and developments taking place in the field of applied phycology.  The book is a unique compilation of 21 Chapters focusing on algal ecology, algal biofertilizers, toxicology, and molecular biology.  The authors have done a tremendous job of synthesizing all the available informations which will be useful for researchers and students alike.  The present book aimed to emphasise on diverse uses of algae.  The various information incorporated in the book by authors who are internationally acknowledged experts in the field of physcology.  The book has been framed with the intention of providing a sufficient depth of the subject to satisfy the needs at a level which will be comprehensive and interesting.  The book will be useful to the students, teachers, scientists and researchers from the different branches of biological, agricultural and pharmaceutical sciences.