REED: SPECIALIZATION OF PARASITIC FUNGI 403 



The general occurrence of specialized races of parasitic fungi makes 

 their study particularly important. It is especially desirable td 

 know the exact host relations of the different races as well as to deter- 

 mine whether the races are stable and constant or whether they are 

 capable of a change of virulence and consequently able to extend their 

 host range. 



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