Athyrium angustum

Athyrium angustum, the northern lady fern, is a fern native to northeastern North America.^[3][4] It was long included in the superspecies Athyrium filix-femina, but is now largely recognized as a distinct species.

Athyrium angustum
Conservation status
Secure  (NatureServe)[1][2]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Division:	Polypodiophyta
Class:	Polypodiopsida
Order:	Polypodiales
Suborder:	Aspleniineae
Family:	Athyriaceae
Genus:	Athyrium
Species:	A. angustum
Binomial name
Athyrium angustum (Willd.) C. Presl

Athyrium angustum has a more southern counterpart — Athyrium asplenioides, the southern lady fern — that is very similar.^[5] The latter has a broader frond, especially at the base.