Physematium

Physematium is a genus of ferns in the family Woodsiaceae. It was treated as a synonym of Woodsia until 2020 when a molecular phylogenetic study showed its distinctiveness. , Plants of the World Online continued to treat the genus as a synonym of Woodsia.

Species
, World Ferns accepted 20 species and two hybrids:
 * Physematium fragile (Trevis.) Kunze
 * Physematium indusiosum (Christ) Li Bing Zhang, N.T.Lu & X.F.Gao
 * Physematium kangdingense (H.S.Kung, Li Bing Zhang & X.S.Guo) Li Bing Zhang, N.T.Lu & X.F.Gao
 * Physematium × kansanum (R.E.Brooks) Li Bing Zhang, N.T.Lu & X.F.Gao
 * Physematium manchuriense (Hook.) Nakai
 * Physematium × maxonii (R.M.Tryon) Li Bing Zhang, N.T.Lu & X.F.Gao
 * Physematium mexicanum (Fée) comb.ined.
 * Physematium molle Kaulf.
 * Physematium montevidense (Spreng.) Shmakov
 * Physematium neomexicanum (Windham) Li Bing Zhang, N.T.Lu & X.F.Gao
 * Physematium obtusum (Spreng.) Hook.
 * Physematium oreganum (D.C.Eaton) Trevis.
 * Physematium phillipsii (Windham) Li Bing Zhang, N.T.Lu & X.F.Gao
 * Physematium plummerae (Lemmon) Li Bing Zhang, N.T.Lu & X.F.Gao
 * Physematium pubescens (Spreng.) Bevis
 * Physematium scopulinum Trevis.