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 Cyatheales A.B.Frank (1877) - tree ferns
           Family Cyatheaceae Kaulf. (1827) - scaly tree ferns
             Genus Alsophila R.Br.