324 



UNIVERSITY OF CALIFORNIA EXPERIMENT STATION. 



**Hr* 



* -^ 



Fig. 7. Photomicrograph of Perithecia taken from Vine Leaf; magnified 30 times. 

 The light colored bodies are immature perithecia; the dark colored, mature 

 peritliecia which have been burst open by pressure. 



Fig. 8. Photomicrograph of Perithecia magnified about 200 times. One perithe- 

 cium has been broken by pressure and the asci are partially pressed out. 

 The winter spores can be seen through the transparent walls of the asci. 



