Smith et al. (2006) divided the Polypodiales into fifteen families, a practice continued in their 2008 revision, with members of the eupolypods placed in two unranked clades. The families are listed in the table. While many of these families had previously been recognized with similar circumscriptions, the authors noted that Dryopteridaceae was more narrowly bounded than in historical circumscriptions, which had included their Tectariaceae, Onocleaceae and Woodsiaceae. The circumscription of Lomariopsidaceae changed dramatically, with most historical genera of that family (except "Lomariopsis" and "Thysanosoria") being moved to Dryopteridaceae, while "Cyclopeltis" and "Nephrolepis" were added. Saccolomataceae were removed from the dennstaedtioids. "Cystodium" was tentatively placed in Lindsaeaceae, away from its historical position with the tree ferns. Woodsiaceae was acknowledged to be of uncertain circumscription and perhaps paraphyletic; the inclusion of "Hypodematium", "Didymochlaena", and "Leucostegia" perhaps also rendering Dryopteridaceae paraphyletic. The grammitids were included in Polypodiaceae to render that family monophyletic.