28 



POLYPODIACEAE 



8. Cheilanthes gracillima D. C. Eaton. 

 Lace-fern. Fig. 54. 



Cheilanthes gracillima D. C. Eaton, in Torr. Bot. Mex. Bound. 234. 

 1859. 



Rhizomes tufted, tlie numerous short branches close, densely 

 paleaceous ; scales light brown in mass, acicular to linear- 

 lanceolate and long-attenuate, 2-3 mm. long. Fronds very 

 numerous, 10-25 cm. long; stipes 5-15 cm. long, dark brown, 

 soon nearly naked; blades linear to oblong-lanceolate, acu- 

 minate, 4-13 cm. long, 2-pinnate (rarely 3-pinnate) ; segments 

 mostly oblong, distant to close, usually oblique, the terminal 

 ones largest; rachises appressed-paleaceous, the scales linear- 

 attenuate from a broader ciliate base, or broader and more 

 numerous in 3-pinnate fronds, gradually more copiously 

 ciliate, the segments densely cinnamomeous-tomentose be- 

 neath, a few minute, stellate scales above ; margins subentire, 

 deeply recurved, nearly concealing the numerous sporangia; 

 leaf tissue herbaceous, dull or yellowish green. 



Rock crevices and ledges, chiefly in the Canadian and arid Transition 

 Zones; Vancouver Island to western Montana, south in the mountains to 

 Nevada and to Mariposa and Marin Counties, California. Type locality: 

 Cascade Mountains, Oregon. 



9. Cheilanthes covillei Maxon. 



Coville's Lip-fern. Fig. 55. 



Cheilanthes coiillei Maxon, Proc. Biol. Soc. Washington 31: 

 147. 1918. 



Rhizome short-creeping, branched, the divisions 

 short, appressed-paleaceous; scales linear to lance- 

 olate, long-attenuate, 1.5-2.5 mm. long, dark brown 

 to blackish, rigid, subentire. Fronds numerous, 

 10-30 cm. long; stipes 5-17 cm. long, brown to dark 

 purplish, with small, linear, pale, ascending scales ; 

 Ijlades oblong to ovate-deltoid, acuminate, 5-14 cm. 

 long, 3-pinnate, the larger segments ternately to 

 pinnately divided; rachises and under side of pinnae 

 densely paleaceous, the scales imbricate, large, ex- 

 ceeding the roundish or irregularly oval segments, 

 whitish or pale castaneous, cordate-ovate to ovate- 

 lanceolate, attached above the closed sinus of the 

 deeply cordate, long-ciliate base; ultimate rachises 

 fibrillose-paleaceous above, the scales partly re- 

 curved upon the segments, these glabrous and naked 

 above; sporangia borne within tlie deeply recurved, 

 lightly crenate outer border; leaf tissue spongiose- 

 herbaceous. 



Rock crevices and rocky slopes, chiefly in the Upper So- 

 noran and Transition Zones; southern California and adja- 

 cent parts of Nevada and Arizona. Type locality: Surprise 

 Canon, Panamint Mountains, Inyo County, California. 



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10. Cheilanthes intertexta Maxon. 

 Coastal Lip-fern. Fig. 56. 



Cheilanthes covillei intertexta Maxon, Proc. Biol. Soc. Washington 31: 149. 1918. 

 Similar in general to C. covillei, but differing in its smaller shorter- 



3 creeping, subnodose rhizomes, its darker green and relatively larger seg- 

 ments, and in vestiture of the blades; segments bearmg a few minute, 

 whitish, stellate, subpersistent scales above, thickly covered beneath with 

 ^< numerous bright castaneous to cinnamomeous, imbricate scales, the larger 

 ones (like those of the rachises beneath) mostly deltoid-lanceolate, long- 

 attenuate, sinuate-denticulate nearly throughout, freely long-ciliate at 

 ^7=-^ the cordate base, underlaid by successively smaller and more copiously 

 iJ^ long-ciliate scales, the ultimate ones often reduced to entangled cilia. 



"■^!fi)'-''--ji^ Rock crevices, Upper Sonoran Zone; Santa Clara, Sonoma, and Mendocino Coun- 

 ■: jc.--,^ ^.^^^ California; also in Nevada (Virginia City). Type locality: Black Mountain, Santa 

 Clara County, California. 



