Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Dryopteris intermedia var. concordiana (Davenp.) M.Broun
Dryopteris intermedia f. concordiana (Davenp.) Clute
Dryopteris spinulosa var. americana (Fisch. ex Kuntze) Fernald
Dryopteris spinulosa var. concordiana (Davenp.) Eastman
Filix spinulosa var. americana (Fisch. ex Kuntze) Farw.
Filix spinulosa var. concordiana (Davenp.) Farw.
Filix-mas rigida var. americana (Fisch. ex Kuntze) Farw.
Filix-mas spinulosa var. americana (Fisch. ex Kuntze) Farw.
Nephrodium spinulosum var. concordianum Davenp.
Thelypteris dilatata var. americana (Fisch. ex Kuntze) House
Thelypteris spinulosa var. americana (Fisch. ex Kuntze) Weath.
Thelypteris spinulosa var. concordiana (Davenp.) Weath.
Dryopteris campyloptera, also known as the mountain wood fern, is a large American fern of higher elevations and latitudes. It was formerly known as Dryopteris spinulosa var. americana. This species also has been mistakenly referred to as D. austriaca and D. dilatata.
A distinctive feature of this fern is that the bottom innermost pinnule on the basal pinnae spans approximately the first two top innermost pinnules on the same pinnae.
