SERIES AMI SPECIES OF GENUS STREPTOMYCES 



i:,i 



:;. Biverticillate, qo spirals. 



4. Biverticillate, with spirals. 



The following species were included in this 

 series: N. reticuli, S. netropsis, S. thioluteus, 



5. griseocameus, and S. verticiUatus. 

 Unfortunately, some cultures show both 



straight and spiral-shaped sporophores. 

 N'omi (1960) criticized the above system; 

 he could not accept the spiral-producing 

 tonus among the true verticil types. He con- 

 sidered the group to consist of the typical 

 "biverticils" comprising both primary and 

 secondary elements; the atypical '•mono- 

 verticils" comprising primary verticils, 

 mixed verticils, and sometimes more com- 

 pound poly verticils. He included the follow- 

 ing species: S. reticuli, S. hiroshimensis, S. 

 albireticuli, S. echimensis, S. griseocarnens, 

 S. thioluU us, s. salmonicida, and S. netropsis. 



Series Tfu 

 ter 11, ana 

 mycetes. 



mophilus is discussed in Chap- 



ng the thermophilic actino- 



Other Possible Series 



In addition to these L6 series of the genus 

 Sin ptomyces, other series could he suggested, 

 based either on the color of the aerial myce- 

 lium or of the substrate growth; ecological 

 or physiological criteria have also been pro- 

 posed tor series characterization. Certain 

 groups, such as the thermophilic forms be- 

 longing to the j^enus Streptomyces are in- 

 cluded in a special series (Thermophilus) , 

 and are discussed elsewhere (Chapter 10), 

 since they are definitely related, because of 

 their close ecological and physiological re- 

 lationships, to the other thermophilic genera. 



