Flora of the Palouse Region 



branches each bipinnate; pinnules oblong, acutish, mostly entire, the upper- 

 most coalescent, the lower more or less lobed. 



var. lanuginosa Hook. Leaves tomentose beneath. 



Only the variety occurs in our limits. Common in coniferous woods, oth- 

 erwise infrequent. 



6. CHEILANTHES. 



Mostly pubescent or tomentose rock-loving and small ferns with 

 much divided leaves: sori terminal on the veins, at first small, 

 finally more or less running together; sporangia often much con- 

 cealed in the scales or hairs which in many species cover the 

 segments. 



The species occurring within our limits have the ultimate seg- 

 ments of the pinnae very small and circular in form and the indusia 

 formed by the incurving of the whole of the leaf margin. 



Leaf-blades glabrous above, bipinnate; ultimate segments mostly entire. 



C. GRACILLIMA. 

 Leaf-blades pubescent above, tripinnate or tripinnatifid; ultimate segments 

 mostly crenate. C. lanuginosa. 



C. gracillima D. C. Eaton. Petioles densely tufted, shining brown, 4-8 

 cm. high, bearing a few scattered lanceolate scales; blades 2-8 cm. long, ob- 

 long-lanceolate, bipinnate; pinnae numerous, crowded, pinnately divided 

 into 5-9 oval mostly entire pinnules, glabrate above, pubescent beneath 

 with rusty matted wool. Common in rock crevices on Kamiack Butte. 



C. lanuginosa Nutt. Petioles densely tufted, 4-6 cm. high, brownish, 

 when young covered with long hair-like scales, at length glabrate; blades 

 4-8 cm. long, oblong-ovate, the lowest usually remote; ultimate segments 

 orbicular or oblong, entire or crenate, crowded; upper surface with a few 

 long hairs, the lower densely matted with whitish or pale-brown long hairs. 

 Bluffs of Snake River near Almota. 



7. ASPLENIUM. 



Large or small ferns with simple, lobed, 2-3 pinnate or pinnati- 

 fid leaves, and linear or oblong sori oblique to the midrib or rachis: 

 leaves uniform or the fertile sometimes different from the sterile; 

 veins free (in ours): indusia straight or curved, opening towards 

 the midrib when single. 



A. filix-foemina Bernh. var. cyclosorum Rupr. Rootstock creeping, 

 short, densely covered by the bases of the petioles; petioles tufted, 20-30 

 cm. long, straw-color or brownish; blades delicate, glabrous, broadly oblong- 

 lanceolate or oblong-ovate, acuminate at theapex, 30-90 cm. long, bipinnate; 

 pinnae oblong-lanceolate, 5-20 cm. long, pinnules oblong, obtuse, obscurely 

 9-13 lobed, the lobes serrate; terminal pinnules confluent: sori short, straight 

 or curved. Common in moist woods, Thatuna Hills. 



