Aspidotis densa (P.Brack) Lellinger
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Lvs clustered on the much-branched rhizome, usually all alike and fertile, the sterile lvs, when present, few and smaller than the fertile and with somewhat smaller, relatively broader, sharply toothed or incised segments; petioles castaneous, 4–18 cm, commonly longer than the blade; fertile blade 2.5–7 cm, a third to fully as wide, often deltoid, tripinnate, the rachis proximally dark like the petiole, distally greenish; pinnae mostly 4–7 offset pairs, the lowest ones the largest; ultimate segments numerous and crowded, ± confluent, linear or elliptic-linear, 3–12 cm × 1–2 mm, tapering to a cartilaginous-mucronate tip; sori set on the indusial flap near its line of junction with the unmodified part of the reflexed margin; 2n=60. Cliff-crevices and moist, rocky slopes; cordilleran region of w. U.S., and locally on serpentine in s. Ont. and Que. (Cryptogramma d.; Pellaea d.; Cheilanthes siliquosa)