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 Osmundales Bercht. & J.Presl (1820) [monotypic]
           Family Osmundaceae Martinov (1820)
             1 Genus Claytosmunda (Y. Yatabe, N. Murakami & K. Iwatsuki) J.S. Metzgar & G. Rouhan (2016)
             2 Genus Leptopteris C.Presl (1845)
             3 Genus Osmunda L. (1753)
             4 Genus Osmundastrum C.Presl
             5 Genus Plenasium C.Presl (1836)
             6 Genus Todea Willd. ex Bernh. (1801)