Phylum [Tracheophyta] Sinnott ex Caval.-Sm. (1998) - vascular plants Subphylum Polypodiophytina Reveal (1996) [monotypic] Class Polypodiopsida Cronquist, Takht. & Zimmerm. (1966) - ferns Subclass Polypodiidae Cronquist, Takht. & Zimmerm. (1966) Order Polypodiales Link (1833) - cathetogyrates (eupolypods) Suborder Polypodiineae Dumort. (1829) Family Nephrolepidaceae Pic.Serm. (1975) [monotypic] - sword ferns Genus Nephrolepis Schott (1834)