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
                 Subfamily Grammitidoideae Parris & Sundue (2016) see [unranked] grammitids
                   Genus Alansmia M. Kessler, A.L.M. Velázquez, M. Sundue & P.H. Labiak (2011)