Uncover the rich botanical treasures of Arunachal Pradesh with this definitive two-volume exploration of its ferns and fern-allies. This detailed taxonomic study covers over 300 taxa from one of India’s most biodiverse regions, offering critical insights into systematics and phytogeography. Essential for botanists, researchers, and students, this treatise illuminates the unique flora of Northeast India’s pristine forests, identifying neo-endemics and range extensions. A must-have for serious inquiries into Indian plant diversity and ecological significance.