ft] 



THALLOPHTTES : FUNGI 



'2-i7 



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 (&).— After Tulasne. 



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

 ing on a spruce (Pic^a). — After 

 Kehm. 



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. 



