i68 



STERILE AND FERTILE REGIONS 



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<4aSj.. " i &ti<y9^Sz&s* ,.- 



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tea StrJitkio/itcris, HofTm. a, fruclifyin.y plant, nun h rcdurcd. \\itli most of the 

 sterile leaves removed ; r, </. lowei .md H]I|M-I purtirnii ufa sterile leaf; c, lower part of a 

 fertile leaf. 6, c, two-thirds natural si/r. (From Kn/\ I\ryf>t. Flcrn.) 



