94 OUR NATIVE FERNS AND THEIR ALLIES. 



hairy with straightish nearly white articulated hairs, which are 

 u.':.ually tipped with a glandular and viscid enlargement; fronds 

 3 — S' long, bipinnate, tlie pinnae rather distant, oblong-ovate; 

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

 'obules forming herbaceous indusia. California. 



§3. Physapteris Presl. Ultimate segments minute, bead- 

 like ; indiisium usually continuous all round the margin ; fronds 

 (Jn our species) bi — qiiadrip innate, the lower surface scaly or tomen- 

 tose or both. 



* Fronds hairy or iomentose 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 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.7'estita Brack.) 

 Califcjrnia, Oregon, British Columbia, Idaho. 



11. C. lendigera (Cav.) Svvz. Rootstock creeping, covered 

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

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

 ovate-oblong, tri — quadripinnate ; ultimate pinnules small, 

 cuneate-obovate. pouch-like from tlie recurved margins, green 

 above, hairy below. Huachuca Mts., Arizona {Lemmon). 



XX 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 Nutt, Myriopteris gracilis 

 Fee.) Illinois to Te.xas, Arizona, and British America. 



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



