Family 41. Hypodematiaceae Ching, Acta Phytotax. Sin. 13: 96 (1975).

3 genera ( Didymochlaena, Hypodematium, Leucostegia).

Reference: Liu et al. (2007a), Tsutsumi & Kato (2006), Schuettpelz & Pryer (2007).

Note:—These genera were not traditionally found to be associated with each other. Hypodematium was associated with the athyrioid ferns, Didymochlaena was previously placed in Dryopteridaceae and Leucostegia in Davalliaceae . Several studies (Liu et al. 2007 a, Tsutsumi & Kato 2006, Schuettpelz & Pryer 2007) have shown nearly simultaneously that these are related and probably form the sister clade to 'Eupolypods I'.