6MUT8. 89 



development through successive generations of the 

 " bunt w spores, but enough is known, on the one 

 hand, to show that this is a true vegetative parasite, 

 and not merely a diseased condition of the tissues 

 of the wheat plant, and on the other that it is 

 perfectly distinct from all the phases of the other 

 and similar parasitic fungi which affect the wheat 

 crop. 



Note. — Professor Fischer de Waldheim has contributed most 

 during late years to our knowledge of the Ustilaginacece. His 

 first important communication on the germination of spores, &c, 

 was translated and published in America ; his last work, on 

 classification, in French (in 1877). Another and more com- 

 plete Monograph, he informs us, is now in progress. The 

 species in the Appendix are revised and grouped in accordance 

 with his viewg. 



