72 Our Xative Ferns. 



gins unchanged, reflexed ; sori brown in a continuous line at the 

 ends of the free veins." South-eastern Ariz. V. Bulletin Torr. 

 Bot. Club, May, 1880. 



8. N. Lemmoni,* D. C. Eaton. "Rootstock short, scaly with 

 narrow, pointed, rigid, dark-brown chaff; stalks dark reddish- 

 brown, wiry, 4' — 6' long, chaffy at the base with scales a little 

 wider and more scarious margined than those of the rootstalk, 

 otherwise smooth ; fronds 6' — 9' long, i' — 1\' wide, Hnear-oblong, 

 pinnate with numerous deltoid or ovate, once or twice pinnatifid 

 pinnae, the lowest ones a little shorter than the middle ones ; upper 

 surface herbaceous-green smooth; lower surface covered with 

 white or slightly yellowish ceraceous powder; sori forming a nar- 

 row sub-m.irginal line; margins of the segments very slightly re- 

 curved." Ariz. V. Bulletin Torr. Bot. Club, June, 1880. 



^'^^ Fronds deltoid-ovate, tri — quadripiunate at base. 

 XRachises straight or nearly so. 



9. N. dealbata,* Kunze. Stipes densely tufted, nearly black ; 

 rachis and all its branchesstraight, capillary ; fronds deltoid-ovate, 

 quadripiunate at base gradually simpler above ; pinnje mostly op- 

 posite ; ultimate pinnules oval, entire or some of them 3-lobed. 

 Upper Missouri to N. Mex. and Ariz. V. 



XXRachises zigzag and flexuous. 



10. N. nivea, Desv. Rhizoma short, chaffy with narrow scales; 

 stipes tufted, 4'— 6' long, wiry, black and polished; fronds 3'— 6' 

 long, ij' — 1'. broad, pyramidal-ovate, tripinnate ; primary pinnae 

 mostly opposite the rachises, nearly straight ; pinnules long-stalked 

 with blunt oblong or roundish, entire or more or less lobed seg- 

 ments;' upper surfaces green, smooth, lower densely coated with 

 pure white powder; sori brown, often descending the free veins 

 half-way to the midvein. Ariz., N. Mex., 1880. V. 



11. N. Fendleri,* Kunze. Stipes densely tufted, dark -brown, 

 3' — 5' long ; rachis and all its branches zigzag and flexuous ; fronds 

 broadly deltoid-ovate 3' — 5' each way, quadripinnate below, grad- 

 ually simpler above; pinnae alternate; ultimate pinnules oval or 

 elliptical, simple or 3-lobed. Col., N. Mex., Ariz. V. 



** Fronds naked below. 

 T2. N. tenera. Gillies. Stipes tufted, brownish, smooth and 

 shining ; fronds 3' — 4' long, ovate-pyramidal, bi— tripinnate ; pinnae 

 mostly opposite, distant, the lower ones somewhat triangular ; 

 ultimate pinnules ovate, often sub-cordate, obtuse, smooth and 

 naked on both surfaces. Southern Utah. V. 



