Athyrium angustum
Introduction '''''Athyrium angustum''''', the '''northern lady fern''', is a 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'', the southern lady fern — that is very similar. The latter has a broader frond, especially at the base.
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