Dryopteris carthusiana (Vill.)
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Dryopteris campyloptera: first pair of leafules on lowest leaflet obviously offset from one another, and mainly occuring in the mountains and more northern areas (vs. D. carthusiana, with the first pair of leafules on lowest leaflet nearly opposite one another and with wide-spread occurrence, mostly at low elevation).
Dryopteris intermedia A.Gray
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Dryopteris campyloptera: first lower leafule on lower leaflet as long as or longer than adjacent leafule and rachis and midrib of leaflets and leafules without stipitate glands (vs. D. intermedia, with the first lower leafule on lower leaflet shorter than the adjacent leafule and rachis and midrib of leaflets and leafules with stipitate glands).
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