''Athyrium angustum'' is known as the northern lady fern, native to northeastern North America. It was long included in the superspecies ''

Athyrium filix-femina ''Athyrium filix-femina'', the lady fern or common lady-fern, is a large, feathery species of fern native to temperate Asia, Europe, North Africa, Canada and the USA. It is often abundant (one of the more common ferns) in damp, shady woodland en ...

'', but is now largely recognized as a distinct species. ''Athyrium angustum'' has a more southern counterpart, ''

Athyrium asplenioides ''Athyrium asplenioides'', or southern lady fern, is a species of the family Athyriaceae. It is a deciduous fern and reaches a height between 1 and 3 feet Its specific epithet ''asplenioides'' means "''Asplenium''-like". Many botanists instead c ...

'' which can be difficult to distinguish between the two. This species, the southern lady fern, has a broader frond, especially at the base.

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* angustum Ferns of the United States Flora of the Great Lakes region (North America) Flora of the Northeastern United States Flora of Canada Flora of Ohio Plants described in 1810 Flora without expected TNC conservation status {{Polypodiales-stub