A Generic Classification of the Thelypteridaceae is a book that represents a major taxonomic revision involving the recircumscription of 14 genera, descriptions of four new genera and three subgenera, and 172 new nomenclatural combinations. A unified classification of the Thelypteridaceae has eluded pteridologists for decades. As the result of detailed morphological study, and with the benefit of a large phylogenomic dataset, a comprehensive classification for one of the largest fern families is now available.