Athyrium distentifolium subsp. americanum (Butters) Hultén

Athyrium distentifolium subsp. americanum (Butters) Hultén is a synonym sensu FNA Ed. Comm., 1993 of:

Pseudathyrium alpestre subsp. americanum (Butters) ined., an accepted subspecies name sensu Hassler, 2014-2024+.