4 Introduction to Fungi [CH. 
containing a somewhat granular substance which is 
the living portion or protoplasm of the fungus. Some 
of the tubes have no dividing walls but others are 
divided by cross walls into compartments called cells, 
Fig. 2. Spore bearing cases of Mucor. (Magnified.) 
the length of which varies with the fungus under 
observation. Further examination of the tufts on the 
bread shows that all the threads do not belong to the 
same fungus. Some of them carry tiny balls, at first 
white and later on turning black, each being borne on 
