Class Equisetopsida C.Agardh (1825) - horsetails see Subclass Equisetidae Warm. (1883)
   monilophytes - ferns see Clade Monilophyta Cantino & Donoghue 2007 [Doyle, Cantino & Donoghue 2020]
     1 Subclass Equisetidae Warm. (1883)
     2 Subclass Marattiidae Klinge (1882)
     3 Subclass Ophioglossidae Klinge (1882)
     4 Subclass Polypodiidae Cronquist, Takht. & Zimmerm. (1966)
     5 Subclass Psilotidae Reveal (1996) see Subclass Ophioglossidae Klinge (1882)