Minnesota Plant Diseases. 



sions. All over the depressions are formed the spore sacs. In 

 some morels the cup does not extend outside of the usually 

 broad stalk, but in others it laps over slightly at the edge. In 

 all morels the cup is drawn out so that seen from the side it is 

 either conical or spherical in appearance. In some forms, the 

 cup is very much convoluted so that it gives a brain-like appear- 

 ance. 



Closely related to these fungi are certain "earth-tongue" 

 fungi. Many of these are black and burnt-wood-like and look 

 much like club fungi or like the sac-capsule-bearing branch of 



FIG. 66. Morel fungi. The ridged caps are to be regarded as everted cups, whose sur- 

 face has become ridged and hollowed to afford large area for spore formation. 

 Original. 



the caterpillar fungus. The upper part of the club, however, is 

 really a pulled-out cup and hence is like a morel which has lost 

 its ridges and become smooth. They gro.w commonly in the 



