Flora van Nederland Haeckel (1866) - plants
   Division Pteridophyta Schimp. (1879) see Subphylum Pteridophytina (Eichler) Cavalier-Sm. (1998)
     Class Filicopsida C.Agardh (1822) - ferns see Class Polypodiopsida Cronquist, Takht. & Zimmerm. (1966)
       Family Ophioglossaceae Martinov (1820) - ophioglossoids
         1 Genus Ophioglossum L. (1753) - adder tongues
         2 Genus Botrychium Sw. (1801) - grapeferns