162 PLANT DISEASES 



The fungus is one of the largest of the Pezizeae, growing 

 in clusters; cups bladderlike, with a very small aperture 

 at first, but expanding when old ; substance fleshy, watery, 

 brittle, pale brown, one to two inches across. 



Ludwig, Zeitschr.fur Pflanzenkr., 1895, P- I2 - 



Fig. 34. Pegiza vesiculosa. A group of plants, nat. size. 



Bulgaria polymorpha, Wetts. This species has been 

 recorded as growing on living oak trunks, and I have also 

 seen it on living beech. 



The fungus is usually densely gregarious, bursting through 

 the bark as a soft, warty, rust-coloured knob, which 

 gradually expands until it is half to one inch across, with a 

 flat, black, highly polished disc or hymenium. Entire 

 substance springy and soft. 



Rhizina inflata, Quelet = Rhizina undulata, Fries. 

 This peculiar fungus, which is not uncommon as a sapro- 



