88 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 mid vein. Arizona, New Mexico. 



Var. dealbata Dav. Segments smaller, more numerous, 

 longer than broad, terminal ones rarely lobed. (N. dealbata 

 Kunze and former editions. Cheilanthes dealbata Pursh.) Up- 

 per Missouri to New Mexico and Arizona. 



12. 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. 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. 



13. 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 oh both surfaces ; possibly only a form of 

 TV*, nivea. Southern Utah, California. 



V. T^ENITIS Swz. 



Sori linear, but the line sometimes interrupted, central or 

 sub-marginal. Veins reticulate. Name from Lat. tania, a 

 band. Includes five species, all tropical. 



i. T. lanceolata R. Br. Rootstock creeping; stipes i' 

 2' long ; fronds simple, 6' 13' long, ' |' broad, tapering both 

 ways, the edge entire or sometimes crisped, midrib prominent ; 

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

 sori ante-mnrginal, in a continuous line near the apex. (Lingua 

 ceri'ina Plum., Pteris lanceolata L , Pteropsis lanceolata Desv., 

 Neurodium lanceolatum Fee.) Old Rhodes Key, Florida (Cur- 

 tiss). 



