86 OUR NATIVE FERNS AND 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 

 {Lemmon), Texas (Drujtiinond), Mexico. 



§ 2. CiNClNALlS Desv. Fronds farinose, with white or yel- 

 low powder {in one species linked). 



* 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 revolute. (N. sulphurea 

 J. Sm., N.pulveracea Kunze.) Southwestern Texas {Reverchon); 

 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 ; margiiis more or less recurved, not 

 covering the sporangia; spores globose, black. {N. Calif ornica 

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

 Arizona (Parry, Lemmon). 



8. N. Hookeri D. C. Eaton. Rootstock short, c'ensely 

 covered wiLh rigid lanceolate dark-brown scales; stipes tufterl, 

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

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



