184 



YEASTS AND MOULDS 



Their general naked-eye appearance and size is well 

 known to any who have observed the felt-like or cottony 

 moulds upon decaying organic matter. 



FIG. 54 



These two half-plates show three months' growth on peptone-maltose agar of 

 t wo megalosporon varieties of the ringworm fungus . Natural size . (Park . ) 



Multiplication occurs in two ways. Upon the hyphse 

 may develop a reproductive organ, the sporangium, 

 containing spores that become free upon its rupture. Or 



