Our Native Ferns And Their Allies With Synoptical Descriptions of the American

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** 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. (Ptert's 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 be Hum et P. Brachypte- rum Moore. ) California.
ft Fronds broader, lanceolate to ovate, bi tripinnate.
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 tripinnate ; primary pin- nae spreading or obliquely ascending, linear, bearing 416 pairs of trifoliate (varying from simple to 5 7 foliate) mucronulate pinnules, I-J-" 2" long ; margins inflexed to midrib in fertile fronds.


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