The linear sequence of Christenhusz et al. (2011), intended for compatibility with the classification of Chase and Reveal (2009), incorporated new phylogenetic evidence to make several changes at the familial level, resulting in an expansion to 23 families. "Lonchitis" and "Cystodium" were removed from the Lindsaeaceae and incorporated into new families, Lonchitidaceae and Cystodiaceae respectively. Within eupolypods I, Woodsiaceae proved to be paraphyletic and was reduced to the genera "Cheilanthopsis", "Hymenocystis", and "Woodsia", while the remainder of its genera were removed to Cystopteridaceae, Diplaziopsidaceae, Rhachidosoraceae, Athyriaceae, and Hemidictyaceae. Within eupolypods II, "Nephrolepis" was placed in a new family, the Nephrolepidaceae, due to uncertainty in its phylogenetic placement, while Hypodematiaceae was split from Dryopteridaceae to contain the three problematic genera mentioned by Smith et al.