FUNGI: SAC FUNGI 



269 



disturbed. When the air is largely excluded from sugar solu- 

 tions in which the yeast is growing, fermentation goes on rapidly 



Edible Morel. Morchella esculenta. The asci, forming hymenium, cover the pitted surface. 



and the growth and multiplication are retarded. With the intro- 

 duction of more air fermentation is retarded, while growth and 

 multiplication are accelerated. Under proper conditions of tem- 

 perature and with very free access of air, spore formation takes 



