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 ; indusium usually continuous all round the margin ; fronds 

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

 tose or both. 



Fronds hairy or tomentose beneath, not scaly. 

 \ Upper surface naked or nearly so. 



ib. 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, he'avily covered beneath 

 with pale-ferruginous matted wool ; indusia yellowish-brown, 

 formed of the continuously curved margin. (C. vestita Brack.) 

 California, Oregon, British Columbia, Idaho. 



11. 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 (Lemmon). 



\\ 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 Texas, Arizona, and British America. 



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



