151 



of frequency. In tobacco only one bud variant was noted in 200,000 

 plants. Benedict (16) regards the production of 50 new Boston ferns in 

 fifteen years as rapid. East (46) notes that all of the asexual variations 

 have been losses of characters. 



The pedigrees of the various Helminthosporium saltants which I have 

 studied are indicated in the following table: 



PEDIGREE TABLE OF SALTANTS 



*Numbers followed by an asterisk are pictorially represented in the plates. 



