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) H Order Osmundales Bercht. & J.Presl (1820) [monotypic] I Order Hymenophyllales Link (1833) [monotypic] J Order Gleicheniales Link (1833) K Order Schizaeales Schimp. (1869) L Order Salviniales Link (1833) - water ferns M Order Cyatheales A.B.Frank (1877) - tree ferns N Order Polypodiales Link (1833) - cathetogyrates