Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           Clade neomura Cavalier-Smith, 1987
             Domain Eukaryota Chatton, 1925 - eukaryotes
               Clade discaria Cavalier-Smith, 2021
                 Clade natates Cavalier-Smith, 2021
                   Clade photaria Cavalier-Smith, 2021
                     Clade eucorta Cavalier-Smith, 2021
                       Superkingdom Corticata Lankester, 1878 - corticates
                         Kingdom Plantae Haeckel (1866) - plants
                           Subkingdom Viridiplantae Caval.-Sm. (1981) - green plants
                             Infrakingdom Streptophyta Caval.-Sm. (1993)
                               [crown] Clade Phragmoplastophyta Lecointre & Le Guyader 2006 [Hall, McCourt, Delwiche, Mishler & Karol 2020]
                                 [crown] Clade Embryophytaᵀ Engler 1887 [Mishler & Qiu 2020]
                                   Clade Pan-Tracheophytaᵀ Cantino & Donoghue 2007 [Cantino & Donoghue 2020]
                                     Clade Apo-Tracheophytaᵀ Cantino & Donoghue 2007 [Cantino & Donoghue 2020]
                                       [crown] Phylum Tracheophytaᵀ Sinnott ex Caval.-Sm. (1998) - vascular plants
                                         Clade Pan-Lycopodiophytaᵀ Cantino & Donoghue 2007 [Cantino & Donoghue 2020]
                                           [crown] Subphylum Lycopodiophytinaᵀ Reveal (1996)
                                             Class Lycopodiopsidaᵀ Bartl. (1830) [monotypic]
                                               Order Lycopodialesᵀ DC. ex Bercht. & J.Presl (1820)
                                                 Family Lycopodiaceaeᵀ P.Beauv. ex Mirb. (1802) - clubmosses
                                                   Subfamily Lycopodioideaeᵀ W. H. Wagner & Beitel ex B. Øllg.
                                                     Genus Spinulum A. Haines
                                                       Spinulum annotinumᵀ (L.) A.Haines (2003)