39 Thelypteris phegopteris (L.) Slosson

Syn.: int. al. Dryopteris phegopteris (L.) C. Chr., Lastrea phegopteris (L.) Bory

This not very variable, widespread species belongs to the circumpolar plants (Hultén, Circumpol. I, p. 116 and map 107). The closely related T. hexagonoptera (Michx) Slosson in southeastern N. America is also mapped.