POLYPODIACEJ5. 99 



coriaceous, the margin of the fertile ones sometimes revolute to 

 the midrib; veins numerous, parallel. (Allosortts andromedce- 

 folius Kaulf., Pteris andromedafolia Kaulf.) California. 



6. P. pulchella (M. et G.) Fee. Stipes tufted, 3' 8' kmg, 

 chaffy at base, nearly black; fronds 3' 9' long, i' 5' broad, 



_^ triangular-ovate, quadripinnate below, gradually simpler above ; 

 lower pinnae deltoid, narrowly triangular above; ultimate pin- 

 nules numerous, i" 3" long, oval or often cordate-ovate, 

 stalked, coriaceous, smooth, the edges often much reflexed. 

 (Allosorus pulchellus Mart, and Gale.) Western Texas and 

 New Mexico. 



ttt Fronds tri quadripinnatifid ; segments linear-oblong ; 

 secondary rachises margined. 



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

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

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

 indusium broad, continuous, the margins slightly erose ; texture 

 chartaceous. (Cheilanthes marginata Hook.) Huachuca Mts., 

 Arizona (Lemmon). 



** Pinnules mucronulate or decidedly acute. 

 t Fronds narrowly linear in outline, 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 mucronulate ; 

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

 var. brachyptera D. C. Eaton, Platyloma belhtm et P. brachypte- 

 rum Moore.) California. 



ft Fronds broader, lanceolate to ovate, bi tripinnate. 



