Rootstock stout, widely creeping, subterranean; stems hairy, 1—2 feet high, erect, straw-colored or brownish, leaves soft-hairy, especially on the under surface, 2—4 feet long, 1—3 feet wide, ternate, the three branches each bipinnate, the upper pinnules undivided, the lower more or less pinnatifid. In dry woods, thickets, and open hillsides, throughout the region. [Sidenote: =Cryptogramma acrostichoides= R. Br. _American Rock-brake._] Rootstock stout, short, and chaffy; stems densely tufted, straw-colored, 2—6 inches long, very slender, chaffy below; leaves ovate or ovate-lanceolate in outline, thin, smooth, 2—3 pinnate, the sterile shorter than the fertile, their segments and pinnules crowded, ovate-oblong or obovate, crenate or slightly sharply cut; fertile leaves with linear or linear-oblong segments half an inch long, the margins at first rolled back to the midrib, at maturity expanded and exposing the light brown sporanges. Forming tufts among rocks throughout the region but most frequent in the Selkirks. [Sidenote: =Cryptogramma Stelleri= (S. G. Gmel.) Prantl. _Slender Cliff-brake_.] Rootstock slender, creeping, thread-like; stems slender, scattered 2—3 inches long, dark brown; leaves thin, ovate in outline 2—5 inches long, 1—2 inches wide, 2—3 pinnate or pinnatifid above, the fertile taller, with narrower pinnules and segments, pinnæ lanceolate-deltoid, cut to the rachis, in few lobed or entire segments; indusium broad; veins conspicuous. In crevices of damp or dripping rocks, preferably limestone, in the Rockies up to 7000 feet elevation; not common. [Sidenote: =Cheilanthes Féei= Moore. _Hairy Lip Fern._] Rootstock creeping, covered with pale rusty-brown scales; stems tufted, wiry, chestnut brown, 2—4 inches long, hairy; leaves oblong-lanceolate in outline 4—9 inches long, gradually attenuate to the apex, twice pinnate; pinnules somewhat distant, lanceolate-deltoid, acute, deeply pinnatifid or incised, more or less covered with stiff hairs and usually somewhat glandular; sori numerous, covered by the infolded ends of the rounded oblong lobes. On rocks and among broken stones at the lower altitudes of the eastern Rockies; growing in matted masses. [Sidenote: =Asplenium viride= Huds. _Green Spleenwort._] Rootstock stout, creeping, chaffy with brown scales; stems numerous, densely tufted, brownish below, green above; leaves linear-lanceolate, 2—8 inches long, once pinnate, pale green, with 12—20 pairs of ovate or rhomboid, crenate; obtuse, unequal-sided pinnules; sori oblong, numerous, or scattered. On dry rocks and slides, frequent through the Rockies. [Sidenote: =Asplenium Filix-fœmina= (L.) Bernh. _Lady Fern._]