at its base, and together with the conidia is thrown 

 some distance by its elasticity. 



SEXUAL EEPEODUCTION. 



Mucor is also propagated sexually in the following 

 wav : — 



(1) Two filaments of the mycelium each put out in 

 the direction of the other a cylindrical protu- 

 berance resembling the filament itself. 



(2) These two protuberances become closely ad- 

 pressed to one another by their ends, and grow 

 into a club-shaped body in which a quantity of 

 protoplasm collects. 



(3) Each of the club-shaped ends is cut off by a 

 septum of cellulose, in this way the two con- 

 jugating cells are formed. 



(4) The separating wall disappears, and the con- 

 tents of both cells mingle, the result being the 

 formation of a Tiijgospore, which is the repro- 

 ductive organ. 



(5) The zygospore rapidly rounds off and enlarges 

 considerably : the two attached mycelial 

 threads grow large and form Suspensors. 



(6) The wall of the zygospore becomes considerably 

 thickened ; the outer portions become dark, 

 cuticularised, and often spiny, the inner re- 

 maining a colorless layer of pure cellulose. 

 The outer coat is called the exospore and the 

 inner the endospore. 



