PELL^A TERNIFOLIA, Link. 
Trifoliate Cliff-Brake. 
Pell^ea TERNIFOLIA: — Root-stock short, thick, nodose, 
chaffy with very narrow dark-brown scales ; stalks clustered, 
purplish-black and polished, three to six inches long ; fronds 
as long as or longer than the stalks, oblong-linear; pinnae from 
four to fifteen pairs, all but a few of the highest ones deeply 
tripartite; segments elongated-oval or linear-obovate, sub- 
coriaceous, somewhat glaucous beneath, green above, slightly 
mucronate, the middle one in large fronds indistinctly petiol- 
ulate ; fertile ones with the edges much recurved ; involucre 
broad, the edge only membranaceous. 
Pellcea ternifolia, Link, Fil. Hort. BeroL, p. 59. — Fee, Gen. Fil, p. 
129. — Hooker, Sp. Fil., i., p. 142; Fil. Exot., t. xv. — Four- 
nier, PI. Mex., Crypt., p. 118. — Eaton, Ferns of the South- 
west, p. 321. 
Pteris ternifolia, Cavanilles, “ Prael. 1801, No. 657.” — Hooker & Gre- 
VILLE, Ic. Fil., t. 126. 
Platyloma ternifolium, J. Smith. — Brackenridge, Fil. U. S. Ex. Exped., 
p. 94. 
Allosorus ternifolius, Kunze, in Linnaea, xxiij., p. 220. 
