Dryopteris dilatata subsp. americana (Fischer ex Kunze) Hultén

Dryopteris dilatata subsp. americana (Fischer ex Kunze) Hultén is a synonym sensu FNA Ed. Comm., 1993 of:

Dryopteris expansa (C. Presl) Fraser-Jenkins & Jermy, an accepted species name sensu FNA Ed. Comm., 1993.