Pteris Aquilina, Linn. 
Eupteris Aquilina, Newman. 
COMMON BRAKES. 
Root — Radicles brown and fibrons ; rhizome thick, long, 
and creeping, succulent, and of a dark brown color. 
Frond — Triangular, bipinnate, from one to ten feet high, 
according to locality. 
Stipes — Erect and strong, half the length of the frond, 
pilose. 
PiNNiE — Pinnate, acute at the apex. 
Pinnules — Pinnatifid, lobes rounded. 
Venation — Lateral veins alternate, twice forked, ex- 
tending to the margin, joined to a longitudinal vein running 
along the margin : this marginal vein forms the receptacle 
for the indusium. 
Fructification — The thecse numerous, globose, and en- 
circled with a beaded elastic ring. The sporules numerous, 
angular, ovate. 
Habitat — Common. 
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