[plants] Haeckel (1866) - plants
   vascular plants see Phylum Tracheophyta Sinnott ex Caval.-Sm. (1998)
     euphyllophytes see Subphylum Euphyllophytina
       "Moniliformopses" nom. inval. - ferns see Infraphylum Moniliformopses Kenrick & Crane, 1997, nom. inval.
         Class Polypodiopsida Cronquist, Takht. & Zimmerm. (1966) - ferns
           1 Order Osmundales Link
           2 Order Hymenophyllales A.B. Frank
           3 Order Gleicheniales Link
           4 Order Schizaeales Schimp.
           5 Order Salviniales Britton (1901) - water ferns
           6 Order Cyatheales A.B. Frank (1877) - tree ferns
           7 Order Polypodiales Link (1833) - polypods