84 



Per cent 



James G. Horsfall 



76 



50 



2S 





Hou 



rs 



12 



28 



24 



Figure 19. germination of conidia of heterosporium phlei at 3° and 25° c, showing 



GOOD GERMINATION AT THE LOWER TEMPERATURE DESPITE A LAG IN THE CURVE 



The results, as shown graphically in figure 19, are exactly those that 

 were predicted. There is a well-defined lag in the germination of the 

 spores at the low temperature. 



Nothing is known of the mode of entrance of the germ tubes except 

 thaf they appear to be able to penetrate uninjured tissues. 



