POL YPODIA CE^. 99 



coriaceous, the margin of the fertile ones sometimes revolute to 

 the midrib; veins numerous, parallel. (Allosorus androjnedce- 

 folius Kaulf., Pteris andromedcefolia Kaulf.) California. 



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

 chaflfy 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. 



ttl' 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 pinnse much the largest ; 

 indusium broad, continuous, the margins slightly erose ; texture 

 chartaceous. {C/teilantkes marginata Wook^ 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; pinnse 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-brov/n ; 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 bellum et P. brachypte- 

 rum Moore.) California. 



tt Fronds broader, lanceolate to ovate, bi — tripinnate. 



