Athyrium filix-femina subsp. angustum (Willdenow) R.T. Clausen

Athyrium filix-femina subsp. angustum (Willdenow) R.T. Clausen is a synonym sensu FNA Ed. Comm., 1993 of:

Athyrium angustum (Willdenow) C. Presl, an accepted species name sensu Hassler, 2014-2024+.