M(»KlM^()l,()(;^ . (•^'|■()|,()(;^ . and i.ii'h: ('^■("L^;s 



79 



/ 



N 



c \ — • 



/ 



^-^ 



10 



zo 



20 



HQ 



/ 



Figure 39. Mycelium and sporulation of a mifromonospora (RoprodiiccMl from: Jcnspii, H. L. Proc. 

 Linnean Soc. N.S.W. 55: 249, 1930). 



celiuin in a nomlried coiidit ioii can also Ix' 

 stained with dyes that readily enter the li\- 

 ing cell. There is little difference in the stain- 

 ing properties of the \-ai-ious types of niy- 

 cehum and the aerial spoi-es. 



I'ractically all actinomycetes are gram- 

 positive. Occasionally, a gram-negative form 



has been reported. The acid-fast properties 

 of actinomycetes, notably among the no- 

 cardias, have aroused considerable attention. 

 Numerous acid-fast strains have been de- 

 scribed. The microaerophilic and pathogenic 

 species of Actinomyces seem devoid of all 

 acid-fastness; so are many species of No- 



