[Vol. 10, 1923] 



176 ANNALS OF THE MISSOURI BOTANICAL GARDEN 





Explanation of Plate 



PLATE 12 



Fig. 1. At left, mycelium of Diaporthe Sojae growing from a disinfected embryo 

 of a seed from a diseased plant. At right, seeds from a single diseased plant, divided 

 into 3 lots according to their apparent degree of injury. One lot appears mouldy 

 because of the presence of a web of mycelium over the seed-coats. Another lot 

 is made up of seeds with badly wrinkled testas and shrunken embryos and which 

 are for the most part incapable of germination. In the third lot the seed-coats 

 are smooth and but little, if at all, discolored, but the greater number of the seeds 

 are infected. 



Fig. 2. Photomicrograph of a section of a perithecium of Diaporthe Sojae showing 

 asci, a portion of the perithecial wall, and cells of the host tissue. Material for 

 sectioning was grown on a petiole of a soybean leaf. Photograph by Mr. A. F. 

 Camp. 



