Dryopteris filix-mas (Linnaeus) Schott ssp. brittonii Fraser-Jenkins & Widén. Britton's Male Fern. Hab: Limestone talus. Dist: NL west to ON, south to w. PA, c. OH, n. MI, and n. WI.
Origin/Endemic status: Native
Syn: = K3, K4, NE; < Dryopteris filix-mas – C, F, FNA2, G, GrPl, Montgomery & Paulton (1981)
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© Louis Imbeau, some rights reserved (CC BY), uploaded by Louis Imbeau 
© Louis Imbeau, some rights reserved (CC BY), uploaded by Louis Imbeau