FILICES. 99 



[Al/osorus pulchellus Mart, and Gale.) Western Texas and 

 New Mexico. 



W\ Fronds tri — quadripinnatifid ; segmovts liiicar-obloiig ; 

 secondaf-y rachises mat'gined. 



J. P. marginata (Hook.) Baker. Stipes, 3' — 9' long, casta- 

 iieous, shining, slightly fibrillose at the base ; fronds 4' — 6' long, 

 nearly as broad, deltoid; tlie lower pinnae much the largest; 

 indusium broad, continuous, the margins slightly erose ; texture 

 chartaceous. (Cheilanthcsniarginata Hook.) Huachuca Mts., 

 Arizona {Lernmon). 



** Pimiulcs viiiaouulate or decidedly acute. 



t Fronds Jiarrowly linear i/i ou/Iine, usually bipinnate. 



8. P. ternifolia (Cav.) Link. Stipes tufted, nearly black, 

 2' — 6' long, fronds 4' — 10' long, narrowly linear; pinnae usually 

 9 — 15 pairs, all but the uppermost trifoliate; segments com- 

 monly linear, slightly mucronate, coriaceous, sessile or the 

 middle one indistinctly stalked, the edges much inflexed in fer- 

 tile fronds ; indusium broad. {Pteris ternifolia Cav.) Western 

 Texas. 



9. P. brachyptera (Moore) Baker. Stipes 2' — 8' long, pur- 

 plish-brown ; fronds 3' — 8' long, narrow in outline from the as- 

 cending secondary rachises, bipinnate; pinnules crowded, 2" — 

 5" long, oblong-linear, simple or trifoliate, acute or mucronuhite ; 

 margins inflexed to the midrib in fertile fronds. {P. ornithopus, 

 7'ar. brachyptera D. C. Eaton, Platylonia belluni et P. brachypte- 

 rum Moore.) California. 



ft Fronds broader, lanceolate to ovate, bi — tripiniiate. 



10. P. ornithopus Hook. Stipes tufted, 3' — 8' long, 

 rather stout, dark-brown; fronds very rigid, 3' — 12' long, 2' — 3' 

 broad, broadly deltoid-lanceolate, bi — tripiimate; primary pin- 

 nae spreading or obliquely ascending, linear, bearing 4 — 16 pairs 

 of trifoliate (varying from simple to 5 — 7 foliate) mucronulate 

 pinnules, i^"— 2" long; margins inflexed to midrib in fertile 

 fronds. {Allosorus niucronatus D. C. Eaton.) California. 



11. P. Wrightiana Hook. Rootstock sliort, thick, densely 

 chaffy; stipes crowded, purplish-brown, 4' — 6' long; fronds 

 ■J — 10' long, i' — 3' broad, lanceolate to deltoid, trifoliate at apex, 



