THALLOPHYTES : FUNGI 



277 



Fig. 244. Head of rye attacked by " er- 

 got" (a), peculiar grain-like masses 

 replacing the grains of rye ; also a 

 mass of "ergot" germinating to 

 form spores (b). — After Tuxasne. 



Fig. 246. A cup-fungns (Pitya) grow- 

 ing on a spruce (Picea).— After 

 Rehm. 



In some of these forms the ascocarp is completely closed, 

 as in the lilac mildew ; in others it is flask-shaped ; in 

 others, as in the cup-fungi, it is like a cup or disk ; but in 

 all the spores are inclosed by a delicate sac, the ascus. 



