Athyrium filix-femina var. michauxii (Sprengel) Farwell
Athyrium filix-femina var. michauxii (Sprengel) Farwell is a synonym sensu FNA Ed. Comm., 1993 of:
Athyrium filix-femina var. angustum (Willdenow) G. Lawson, an accepted variety name sensu FNA Ed. Comm., 1993.