Waksman 



30 



Actinoniycetes 



Table 2: Comparison of cultural, morphologic and .staining reactions of species of Nocardia 

 (75).- 



Organisms growing in the form of a much-branched myceHum with 

 a typical aerial mycelium and spore formation. Aerobic. Sometimes 

 parasitic, with clubbed ends of radiating threads conspicuous in lesions 

 in the animal body. 



This genus can be divided, on the basis of the structure of sporulat- 

 ing hyphae into five groups: 



Group 1 : Straight sporulating hyphae, monopodial branching, never produc- 

 ing regular spirals. 



Group 2: Spore-bearing hyphae arranged in clusters, or broom-shaped arising 

 from compression of the sporophores. 



Group 3: Spiral formation in aerial mycelium; long, open spirals. 



Group 4: Spiral formation in aerial mycelium; short, compact spirals. 



Group 5 : Spore-bearing h)^hae arranged on mycelium in whorls or tufts. 



