''Athyrium angustum'' is known as the northern lady fern, native to northeastern

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...

. 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 ''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.

References

External links

* 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