THALLOFHYTES : FUNGI 
277 
FIG. 245. Two species of cup-fungus 
(Pezlza). After LINDAU. 
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 (6). After TULASNE. 
FIG. 246. A cup-fungus (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. 
