Northern Lady Fern

''Athyrium angustum'' is known as the northern lady fern, native to northeastern North America. It was long included in the superspecies ''Athyrium filix-femina'', but is now largely recognized as a distinct species.

''Athyrium angustum'' has a more southern counterpart, ''Athyrium asplenioides''. This species, the southern lady fern, has a broader frond, especially at the base.