94 Our Native Ferns. 



side partly under the sorus, early opening, free at the other side, 

 and thrown back or withering away. Veins free. 



* Fronds ovate-lanceolate, bi — tripinnate. 



1. C. bulbifera,* Bernh. Stipes 4'— 6' long; fronds lanceo- 

 late elongated, 1° — 2° long; bi — tripinnatifid, pinna lanceolate- 

 oblong ; pinnules crowded, toothed or pinnatifid ; rachis wingless 

 often bearing bulblets underneath ; indusium short truncate on the 

 free side. N. Eng. to Va. and N. C. III. 



2. C. fragilis, Bernh. Fronds oblong-lanceolate, 6/—V long, 

 i' — 2^' broad, bi— tripinnate; pinnae and pinnules lanceolate or 

 ovate in outline, decurrent along the margined or winged rachis ; 

 indusium tapering or acute at the free end. Narrower, less di- 

 vided, specimens, barely bipinnate with obtuse and bluntly toothed 

 pinnules form the var. dentata. Hook. Like many other so-called 

 varieties it passes insensibly into the typical form. N. Eng. to Cal. 

 and northward. II. 



** Fronds deltoid-ovate, tri — quadripinnate. 



3. C. montana, Bernh. Rhizoma long, slender, creeping ; 

 stipes 6' — 9' long, slender; fronds about 6' each way; lowest 

 pinnae ^Itoid-lanceolate, much larger than those above, their in- 

 ferior pinnules 1' — i^' long; segments cut to the rachis into ob- 

 long lobes, deeply and sharply toothed ; sori numerous. Col., L. 

 Superior and northward. II. 



XXII. ONOCLEA, L. 



Sori round, borne on the back of the veins of the contracted 

 fertile frond, and quite concealed by their revolute margins. In- 

 dusium very thin membranous, hemispherical or hood-like fixed 

 at the inferior side of the sorus. Fronds conspicuously dimorphous. 



\\. EUONOCLEA. Veins of sterile frond copiously anasto- 

 mosing. 



I. O. sensibilis, L. (Sensitive-fern.) Fertile fronds bi- 

 pinnate, much contracted ; pinnules short, usually rolled up and 

 converted into berry-shaped closed involucres, and forming a one 

 sided panicle ; sterile fronds broadly triangular, deeply pinnatifid 

 into lanceolate-oblong pinnae, which are entire, undulate, or the 

 lowest pair sinuate pinnatifid ; veins copiously anastomosing. In 

 var. obtusilobata, Torr., the sterile fronds are again pinnatifid, 

 more or less contracted and revolute, and bear a few sori. N. 

 Eng. to Fla. and Kan. III. 



