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 Polypodiaceae J.Presl & C.Presl (1822) - polygrams
                 1 Subfamily Loxogrammoideae H.Schneid. (2011)
                 2 Subfamily Platycerioideae B.K.Nayar (1970)
                 3 Subfamily Drynarioideae Crabbe, Jermy & Mickel (1975)
                 4 Subfamily Microsoroideae B.K.Nayar (1970)
                 5 Subfamily Polypodioideae Sweet (1826) [paraphyletic]
                 5.n Subfamily Grammitidoideae Parris & Sundue (2016) see [unranked] grammitids
                 6 Genus Synammia C.Presl (1836)