GROUPS AND SPECIES OF GENUS STREPTOMYCES 



103 



Figure 30. Spore formation in Streptomyces species (Reproduced from: Shinobu, H. Mem. Osaka 

 Univ. Lib. Arts and Ed. B. Nat. Sci. 7. L958). 



terminal portion of the branching hyphae. Series 10. Monoverticillate, straighl to 

 Series 1. Sporophores straighl to flexu- flexuous. 



ous. Scries 1 1 . Monoverticillate, spirals. 



Scries 2. Sporophores form open loops. Series 12. Biverticillate, straighl to flexu- 



Series 3. Sporophores form spirals. ous. 



Section 11. Aerial mycelium branches in tuft Series \:\. Biverticillate, spirals. 



formations. Sporophores produced at the Section V. 



terminal portion of the branching hyphae. Scries 11. No aerial mycelium. 



Scries 1. Sporophores straighl to flexu- 

 ous. 



Series .">. Sporophores form open loops. 



Scries 6. Sporophores form spirals. 

 Section III. Aerial mycelium forms long 



main stem. Sporophores produced al the 



terminal portion of side branches. Non- 

 vert ieillate. 



Series 7. Sporophores straighl to flexu- 

 ous. 



I I . \m\1I SYSTEM 



Finally a purely morphological system 



may be listed. \ i (1959) proposed a 



division of the genus Streptomyces into eighl 

 morphological groups. He returned to an 



earlier concept of Drechslcr (1919) that the 

 nature of the turn of the spirals, namely 

 sinistrorse and dextrorse, is an important 

 characteristic of Streptomyces species. lie 



Series 8. Sporophores form open loops, recognized, however, that some cultures may 



Series !). Sporophores form spirals. he rather indefinite in tin- respect. 



Section IV. Aerial mycelium forms long 



', ,, \ Serial hyphae somewhal flexuous or straight; 



main stem. Sporophores produced a1 , ' , .... , ,., 



lew long nypnae. I lie terminal filaments de 

 terminal portion ot side branches. Ver- velop into spiral-shaped sporophores. 



I ieillate. 1 . Spirals sinisl rorse. 



