Pteridium aquilinum var. latiusculum (Desv.) A.Heller ex Underw.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Variety Description - Longest entire lf-segment or part of a segment ca 4 times as long as wide, the terminal segments mostly 5–8 mm wide; margins of the ultimate segments commonly somewhat hairy; throughout our range, and also in Eurasia.