Memoir 109 



Plate I 



. 



1, STIGMA BRANCHES OF THE OAT FLOWER (SWEDISH SELECT), SHOW- 

 ING GERMINATION OF USTILAGO AVENAE SPORES AT POLLINATION TIME. 

 X -l 2 D 



2, EPIDERMIS OF THE PERICARP OF A MATURE OAT (SWEDISH SELECT), 

 SHOWING THE MYCELD \l 01 I STI1 \<<> UTWi: IX. ON. AND CNDER THE 

 CELLS. THE EPIDERMIS WAS STRIPPED FROM THE CARYOPSIS AND THE' 

 PHOTOGRAPH TAKEN FROM THE [NNER SIDE. 225 



