86 OUR NATIVE FERXS AXD THEIR ALLIES. 



5. N. Aschenborniana Klotzsch. Rootstock short, 

 creeping; stipes tufted, 2' 3' long, wiry, ebeneous, densely 

 scaly; fronds 4' 10' long, 2' 3' broad, oblong-lanceolate, tri- 

 pinnatifid ; pinnae lanceolate, cut into linear-oblong, crenate or 

 pinnatifid pinnules ; upper surface pale-green, the lower densely 

 matted with linear, ciliate, bright ferruginous scales, beneath 

 which it is subfarinose ; sori black. Huachuca Mts., Arizona 

 (Lemmori), Texas (Drumtnond), Mexico. 



2. CINCINALIS Desv. Fronds farinose, with -white or yel- 

 low powder (in one species naked). 



* Fronds farinose below. 

 t Fronds deltoid or pentagonal, barely bipinnate. 



6. N. Candida (M. et G.) Hook. Rootstock creeping, with 

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

 and shining; fronds rather shorter than stipe, deltoid-ovate, 

 pinnate; lowest pinnae with the lowest inferior pinnules elon- 

 gate and again pinnatifid, the three or four succeeding pairs lan- 

 ceolate, pinnatifid into oblong segments, the uppermost pinnae 

 like the segments of the lower ; upper surface green ; lower sur- 

 face whitish farinose; margin slightly re volute. (N. sulp/iurea 

 J. Sm., N.pitlveracea Kunze.) Southwestern Texas (Rei.>erchori); 

 New Mexico ( Wright). 



7. N. cretacea Liebm. Rootstock short, oblique, the scales 

 rigid, lanceolate, with a narrow membranous margin ; stipes 

 2' 7' long, brownish, wiry, scaly when young; fronds i' 2' 

 long, broadly deltoid-ovate to pentagonal, tri quadripinnati- 

 fid at base, gradually simpler above ; ultimate segments oblong 

 or triangular-oblong, numerous, crowded ; upper surface more or 

 less covered with deciduous glands ; lower surface copiously 

 farinose with yellow or whitish powder except on the promi- 

 nent dark-brown rachises; margins more or less recurved, not 

 covering the sporangia; spores globose, black. (TV*. Californica 

 D.C.Eaton.) San Diego County, California (Cleveland, Parish); 

 Arizona (Parry, Lemmori). 



B. N. Hookeri D. C. Eaton. Rootstock short, densely 

 covered with rigid lanceolate dark-brown scales ; stipes tufted, 

 4' 8' long, reddish-brown, wiry, shining ; fronds 2' 3' each 

 way, nearly pentagonal, composed of three divisions ; the mid- 



