U. S. DEPARTMENT OF AGRICULTURE. 



BUREAU OF PLANT INDUSTRY BULLETIN No. 37. 



B. T. (lAl.l.owAY, Vliiij iij linnau. 



FORIIATIOX OF THE SPORES IX THE SPORANI^IA OF 

 . NIGRICANS AND OF FHYCOJIYCES NITENS. 



BY 



DEANE B. SWINDLE, 

 Assistant in 1*athology, Laboratory of Plant rATiioLOGY. 



VEGETABLE PHYSIOLOGICAL AND PATHOLOGICAL 

 INVESTIGATIONS. 



LFBRARY 



Issued .Iink 27, W08. NEW YORK 



BOTANfCAL 



Garden 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1903. 



