i68 



STERILE AND FERTILE REGIONS 



FIG. 89. 



Onoclca Struthiopteris, Hoffm. a, fructifying plant, much reduced, with most of the 

 sterile leaves removed ; c, d, lower and upper portions of a sterile leaf; e, lower part of a 

 fertile leaf, b, c, two-thirds natural size. (From Rab. Krypt. Flora.) 



