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.
Phylogeny , World Ferns accepted 20 species and two hybrids:
Phylogeny from Fern Tree of Life Other species include:P. angolense (Schelpe) Shmakov P. burgessianum (Gerrard ex Hooker & Baker) Shmakov P. canescens (Kunze) Trevis. P. × kansanum (R.E.Brooks) Li Bing Zhang, N.T.Lu & X.F.Gao P. × maxonii (R.M.Tryon) Li Bing Zhang, N.T.Lu & X.F.Gao P. mexicanum (Fée) comb.ined. P. pubescens (Spreng.) Bevis
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