168 STERILE AND FERTILE REGIONS 
td os 
nam Oa 
eet 
dtd U 
DENN 
arereyy 
“ed dd 
cece OTT 
Ze 
PAARL 
) Vy paa VII 
LLL L LLL EELS 
ql Yas? 
r~ 
LYWIO VE 
Onoclea Struthiopteris, Hoffm. a, fructifying plant, much reduced, with most of the 
sterile leaves removed ; ¢, @, lower and upper portions of a sterile leaf; e, lower part of a 
fertile leaf. 4, c, two-thirds natural size. (From Rad. Avafpt. Flora.) 
