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 1.1 Suborder Saccolomatineae [monotypic] 1.2 Suborder Lindsaeineae 2.1 Suborder Pteridineae [monotypic] 2.2.1 Suborder Dennstaedtiineae Schwartsb. & Hovenkamp (2016) [monotypic] 2.2.2 (eupolypods)