been formed during the last few years, scarcely a score of 

 sheets dating before 1896. Besides the collections of the 

 author, the chief have been those of Mr. E. H. Favor, those 

 of Dr. Charles Thorn and his pupils, consisting almost 

 wholly of vernal plants, and those of Dr. B. M. Duggar and 

 his assistants, which include an extensive and valuable col- 

 lection of fungi. 



It is with sincere pleasure that the author acknowledges 

 his obligations to Dr. B. M. Duggar, whose inspiring help- 

 fulness during these studies justifies more than this passing 

 word. 



To Professor C. F. Marbut is due the map which accom- 

 panies this paper, and to him the author gives his heartiest 

 thanks. 



