Athyrium angustum explained

Athyrium angustum, the northern lady fern, is a fern native to northeastern North America.^{[1] [2]} 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.^[3] The latter has a broader frond, especially at the base.

References

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Notes and References

1. Hazen . H. H. . 1947 . Survey of Ferns in a Maine Mountain Area . American Fern Journal . 37 . 3 . 79–82 . 10.2307/1545194. 1545194 .
2. Wright . Kenneth E. . Crandall . Dorothy L. . 1941 . Rhode Island Ferns . Torreya . 41 . 3 . 73–75 . 40597390 . 0096-3844.
3. Benedict . R. C. . 1934 . Can Anyone Readily Distinguish the Northern and Southern Lady Fern Species? . American Fern Journal . 24 . 4 . 117–119 . 10.2307/1544507. 1544507 .