Explore the fascinating aquatic flora of Bihar, India, with this crucial study on Oedogoniales (Chlorophyceae). Uncover significant advancements in Indian algae research, detailing 10 newly discovered species, 10 taxa new to India, and 21 additions to Bihar’s documented algal diversity. This monograph offers in-depth taxonomic analysis, evolutionary insights, and extensive visual evidence, featuring 160 microphotographs and 98 drawings. An indispensable reference for botanists, phycologists, and students of Indian botany and freshwater ecosystems.