PRIMARY MYCELIUM 



FiGiRE 36. Diagrammatic life cycle of a streptomyce.s. The primary and secondary mycelia are 

 separated for convenience of illustration though usually the latter originates within the former. At- 

 tention is called to the gradual shrinkage of endofragments of the primary mycelium to produce iso- 

 gametes; the secondary mycelium may he hisporulative (Reproduced from: Roach, A. W. and Silvey, 

 J. K. G. Trans. Am. Microscop. Soc. 77: 36, 1958). 



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