- Polystichum, genus Polystichum - small to medium-sized terrestrial ferns especially holly ferns; in some classification systems placed in Polypodiaceae
--1 is a kind of fern genus
--1 is a member of
--1 has members:Dryopteridaceae, family Dryopteridaceae, Athyriaceae, family Athyriaceae Christmas fern, canker brake, dagger fern, evergreen wood fern, Polystichum acrostichoides; holly fern; soft shield fern, Polystichum setiferum