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

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

 'obules forming herbaceous indusia. California. 



3. PHYSAPTE'RIS Presl. Ultimate segments minute, bead- 

 like ; indusium 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. 

 t Upper surface naked or nearly so. 



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

 densely tufted, 2' 6' long, dark-brown ; fronds f 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. vestita Brack.) 

 California, Oregon, British Columbia, Idaho. 



n. C. lendigera (Cav.) Swz. Rootstock creeping, covered 

 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 {Lemmori). 

 \\ Upper surface decidedly pubescent. 

 \ Stipes tomentose or smooth. 



12. C. gracilis (Fee) Mett. 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 below, 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. vestita Hook. p. p., C. lanuginosa Nntt, Myriopteris gracilis 

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



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



