Athyrium filix-femina var. angustum (Willdenow) G. Lawson  

Family: Dryopteridaceae

northern lady fern, more...subarctic lady fern

[Athyrium angustum (Willd.) C. Presl, moreAthyrium angustum f. rubellum , Athyrium filix-femina subsp. angustum (Willdenow) Clausen, Athyrium filix-femina var. michauxii (Spreng.) Farw., Athyrium filix-femina var. rubellum Gilbert]