Pteridium aquilinum var. pseudocaudatum (Clute) A.Heller
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 9 times as long as wide, the terminal segments mostly 2–4.5 mm wide; margins of the ultimate segments nearly or quite glabrous; se. U.S., n. to Mo., s. Ind., O., and on the coastal plain to Cape Cod, Mass.