A description is given of the family. Paragraphs on Anatomy and Morphology, Gametophyte, Karyology and Hybridization, Ecology and Distribution, and Taxonomy and Affinity are included. A key to the five Malesian genera is given. For the genus Blechnum, with 19 species, separate paragraphs on Biogeography and Morphology and Terminology are given. Malesian Blechnaceae counts 30 species in all. Illustration is by 21 line drawings, 2 black-and-white plates, and 15 distribution maps.