[plants] Haeckel (1866) - plants
   vascular plants see Phylum Tracheophyta Sinnott ex Caval.-Sm. (1998)
     lycophytes see Subphylum Lycophytina "Banks, 1968"
       Class Lycopodiopsida Bartl. (1830)
         1 Order †Protolepidodendrales Koidzumi (1939)
         2 Order †Lepidodendrales Haeckel (1868)
         3 Order Lycopodiales DC. ex Bercht. & J.Presl (1820)
         4 Order Isoetales Prantl (1874) - quillworts see Order Isoëtales Prantl (1874)
         5 Order Selaginellales Prantl (1874)