Notholcena. 71 



4. N. Newberryi,* D. C. Eaton. (Cotton-fern). Rhizoma 

 with very narrow dark bristly Scales ; stipes tuited 3' — 5' long, 

 blackish-brown, woolly when young, with pale ferruginous to- 

 mentum ; fronds 3' — 5' long, lanceolate-oblong, covered most 

 densely beneath with fine whitish hairs, tri — quadripinnate; ultimate 

 segments roundish-obovate \" — Y' broad. Cal. IV. 



\ 2. CINCINALTS, Desv. Fronds farinose, with white or yel- 

 low powder (in one species naked). 



'''Fronds farinose below. 

 \ Fronds deltoid or pentagonal, barely bipinnate. 



5. N. Candida, Hook. Rhizoma creeping, with narrow rigid 

 nearly black scales ; stipes tufted, 3' — 6' long, wiry, black and 

 shining ; fronds shorter than stipe, deltoid-ovate, pinnate, lowest 

 pinnae havirig the lowest inferior pinnules elongated and again pin- 

 natifid, three or four next pairs of pinnae lanceolate, pinnatifid into 

 oblong segments ; upper pinnae like segments of the middle ones ; 

 segments whitish farinose beneath, green above, margin slightly 

 revolute. Te.x. to Cal. V. 



6. N. Hookeri, D. C. Eaton. Rhizoma short, densely covered 

 with rigid lanceolate dark-brown scales ; stipes tufted, 4' — 8' long, 

 reddish-brown, wiry, shining; fronds 2' — 3' each way, nearly pen- 

 tagonal, composed of three divisions; the middle one slightly 

 stalked, rhomboid-ovate, pinnatifid into a few toothed segments, 

 the second pair larger than the first ; the side divisions sessile, 

 deltoid, pinnatifid on upper side as in middle division, but each 

 bearing on the lower side a single large pinnatifid basal segment, 

 and above it smaller segments like those of the upper side; lower 

 surface covered with pale yellow powder. [N. cretacea of check 

 lists). Tex., N. Mex. V. 



'^\ Fronds lanceolate or linear-oblong, bipinnate or tripinnatijid. 



7. N. Grayi,* Dav. "Stipes tufted, ? \Y — 3J' long, terete, 

 chestnut-brown, with nearly black, rigid, linear-acuminate scales 

 below, paler, deciduous scales above; fronds 2' — 4' long, J' — 1\' 

 broad, oblong-lanceolate, once or twice pinnate, upper surface 

 sparingly, under thickly covered with white powder ; rachises 

 brown like the stipes, coated with a granular substance extending 

 down the stipes, and clothed with long, slender, entire or ciliated, 

 pale or whitish scales ; pinnae short-stalked, oblique, unequally 

 triangular-ovate, ovate-lanceolate, or lanceolate, deeply pinnatifid 

 or pinnately divided into i or 2 pairs of short-stalked or sessile, 

 oblong, pinnatifid, obtuse pinnules, the remaining portion ob- 

 liquely pinnatifid with alternate, lobed or entire segments ; mar- 



