94 OUR NATIVE FERNS AND THEIR ALLIES. 



hairy with straightish nearly white articulated hairs, which are 

 usually tipped with a glandular and viscid enlargement; fronds 

 3' 8' long, bipinnate, the pinnae rather distant, oblong-ovate; 

 pinnules roundish-ovate, crenate and incised, the ends of the 

 lobules forming herbaceous indusia. California. 



3. PHYSAPTERIS Presl. Ultimate segments minute, bead- 

 like ; indusiuin usually continuous all round the margin ; fronds 

 (in our species) bi quadripinnate, the lower surf ace scaly or tomen- 

 tose or both. 



Fronds hairy or tomentose beneath, not scaly. 



\ Upper surface naked or nearly so. 



10. C. gracillima D. C. Eaton. (LACE-FERN.) Stipes 

 densely tufted, 2' 6' long, dark-brown ; fronds i' 4' long, nar- 

 rowly ovate-lanceolate, bipinnate; pinnae numerous, crowded, 

 pinnately divided into about nine oblong-oval pinnules, at first 

 slightly webby above, soon smooth, heavily covered beneath 

 with pale ferruginous matted wool; indusia yellowish-brown, 

 formed of the continuously curved margin. (C. 1'estita Brack.) 

 California, Oregon, British Columbia. 



ir. C. lendigera Swz. Rootstock cord-like, creeping, cov- 

 ered with narrow scales; stipes rather distant, 4' 8' long, at first 

 loosely tomentose, at length nearly smooth ; fronds 4' 8' long, 

 ovate-oblong, tri quadripinnate ; ultimate pinnules small, 

 cuneate-obovate, pouch-like from the recurved margins, green 

 above, hairy below. Huachuca Mts., Arizona (Lemmon}. 

 ft Upper surface decidedly pubescent. 



\ Stipes tomentose or smooth. 



-i2. C. lanuginosa Nutt. Stipes densely tufted, slender, 

 at first clothed with woolly hairs, at length nearly smooth ; 

 fronds 2' 4' long, ovate-lanceolate, tripinnate or tripinnatifid, 

 rarely bipinnate; pinnae deltoid beloxv, oblong-ovate above, the 

 lowest distant ; ultimate pinnules minute, the terminal one 

 slightly largest, crowded ; upper surface scantily tomentose, the 

 lower densely matted with whitish-brown, woolly hairs ; indu- 

 sia narrow, formed of the unchanged margin. (C.lanosa Eaton, 

 C. i>estita Hook, in part, C. gracilis Mett., Myrioptcris gracilis 

 Fee.) Illinois to Texas, Arizona, and British America. 



13. C. tomentosa Link. Stipes tufted, 4' 6' long, rather 



