Kingdom Chlorobiota C.Jeffrey ex Doweld (2001) - plants see Subkingdom Viridiplantae Caval.-Sm. (1981) Count: [*†*] 10p;24c;72o;262f;1685g; †5p;17c;56o;141f;593g Subkingdom Pteridobiotina Britton & A. Br. (1896) Count: [*†*] 6p;9c;20o;58f;370g; †2p;12c;42o;103f;488g Superdivision Cycadophytanae Doweld (2001) see Superphylum Cycadophytanae Doweld (2001) Count: [*†*] 5p;5c;9o;12f;83g; †2p;12c;37o;72f;361g Division †Progymnospermophyta Bold et al. see Phylum Progymnospermophyta Lang (1925) Count: [†*] †2c;7o;7f;23g [7 Apr 2023] Class †Progymnospermopsida Beck (1960) see Clade Pan-Spermatophyta Cantino & Donoghue 2007 [Cantino, Doyle & Donoghue 2020] Count: [†*] †4o;4f;14g [1 Apr 2023] Order †Archaeopteridales W.Zimm. (1930) [monotypic] Count: [†*] †1f;7g [1 Apr 2023] Family †Archaeopteridaceae Nicholson & Lydekker (1889) Count: [†*] †7g [1 Apr 2023] Genus †Callixylon Zalessky (1911) Count: -