Aspidium rigidum var. argutum (Kaulfuss) D.C. Eaton

Aspidium rigidum var. argutum (Kaulfuss) D.C. Eaton is a synonym sensu Hassler, 2014-2024+ of:

Dryopteris arguta (Kaulfuss) Watt, an accepted species name sensu Hassler, 2014-2024+.