S8 OUR NATIVE FERNS AND THEIR ALLIES. 



fronds 3' — 6' long, i^'— 2' broad, ovate, lanceolate, triangular- 

 ovate or deltoid, tripinnate ; primary pinnae mostly opposite, 

 the rachises nearly straight ; pinnules long-stalked ; segments 

 roundish, nearly as broad as long, terminal ones larger, entire 

 or 3-lobed ; upper surfaces green, smooth, lower densely coated 

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

 veins half-way to the midvein. Arizona, New Mexico. 



13. N. dealbata (Pursh) Kunze. Segments more numerous, 

 longer than broad, terminal ones rarely lobed ; pinnae commonly 

 opposite ; frond deltoid. (Cheilanihes dealbata Pursh.) Upper 

 Missouri to New Mexico and Arizona. 



f 14. N. Fendleri Kunze. Stipes densely tufted, dark- 

 brown, 3' — 5' long ; rachis and all its branches zigzag and 

 fiexuous ; fronds broadly deltoid-ovate, 3' — 5' each way, quad- 

 ripinnate below, gradually simpler above ; pinnae alternate ; 

 ultimate pinnules oval or elliptical, simple or 3-lobed. Colo- 

 rado, New Mexico, Arizona. 



** Fronds naked below. 



15. 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 tri- 

 angular; ultimate pinnules ovate, often sub-cordate, obtuse, 

 smooth, and naked on both surfaces ; possibly only a form of 

 N. nivea. Southern Utah, California. 



VIII. CHEILOGRAMMA Blume. 



Sori linear, but the line sometimes interrupted, central or 

 submarginal. Veins reticulate. Name from Gr. ;i;ejAoS, lip, 

 and ypdfxua, a line. Contains a single species. 



I. C. lanceolata (L.) Blume. Rootstock creeping; stipes 

 i' — 2' long; fronds simple, 6' — 13' long, ^' — f broad, tapering 

 both ways, the edge entire or sometimes crisped, midrib promi- 

 nent ; veins immersed, the exterior free and clubbed at their 

 apices ; sori ante-marginal, in a continuous line near the apex. 

 (Pteris lanceolata L., Tce^iitis lanceolata R. Br., Neiirodhim lan- 

 ceolaium Fee.) Old Rhodes Key, Florida (Curtiss). 



