Cheilanthoideae  Cheilanthoideae is one of the five subfamilies of the fern family Pteridaceae. The subfamily is thought to be monophyletic, but some of the genera into which it has been divided are not, and the taxonomic status of many of its genera and species remains uncertain, with radically different approaches in use . The following phylogram shows a likely relationship between Cheilanthoideae and the other Pteridaceae subfamilies. Although subfamily Cheilanthoideae itself is thought to be monophyletic, many of the genera into which it has been divided (including "Cheilanthes", "Doryopteris", "Notholaena", and "Pellaea") have been shown to be polyphyletic. The division of the subfamily Cheilanthoideae into genera and species remains uncertain . Christenhusz et al. (2011), the Pteridophyte Phylogeny Group classification of 2016 (PPG I), and the November 2019 version of the "Checklist of Ferns and Lycophytes of the World" ("World Ferns" 8.11) agree on the following genera:  Some other genera that have been included in the subfamily (or split off from genera included in the subfamily) are:  Other sources take a radically different approach. , "Plants of the World Online" places all of the possible genera of the Cheilanthoideae in the single genus "Hemionitis". ("Parahemionitis" is treated as a synonym of "Acrostichum", a member of a different subfamily.)