Asplenium septentrionale (L.) Hoffm.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Plants forming large, very dense tufts, with numerous, crowded, slender lvs 5–15 cm, grass-like in aspect; petiole greenish, very slender, ca 0.5 mm thick, ± erect, generally longer than the blade; blades irregularly forked, with a few narrow segments (or some unforked), each segment 1–2 cm × 1–2 mm, entire or with a few long, slender teeth (reduced pinnules), and with a single compound sorus (subtended by a ± continuous indusium just within the margin on each side) running its whole length; 2n=144. Interruptedly circumboreal, in Amer. mostly cordilleran, but disjunct on shale in Monroe and Hardy cos., W.Va.
forked spleenwort, grass-fern