34 ACTINOMYCETES 



6. Growth on agar pink to crimson. 



25. Nocardia madurae 



7. Growth on agar dark brown and even black. 



26. Nocardia nigra 



8. Growth consistency soft; aerial mycelium sparse. 



27. Nocardia lutea 



9. Growth consistency medium; aerial mycelium profuse. 



28. Nocardia blackwellii 



10. Good action on milk; growth consistency firm; aerial mycelium 

 liberal. 



29. Nocardia cuniculi 



11. Pigment on protein media deep brown. 



30. Nocardia rangoonensis 



12. Pigment on protein media light brown. 



31. Nocardia caviae 

 II. Proteolytic. 



1. Growth on nutrient agar with rapid formation of unbranched 

 diphtheroid-like rods; no typical cystites; broth turbid. 



32. Nocardia actinomorpha 



2. Growth white, shiny or pale, dough-like consistency; breaks up 

 into short rods. 



33. Nocardia alba 



3. Growth on nutrient agar with extensive mycelium; simple un- 

 branched rods not formed; cystites present. Broth clear. 



34. Nocardia fiavescens 



4. Growth cream-colored. 



35. Nocardia gibsonii 



5. Growth rose-colored to bright red or red-orange. 



36. Nocardia fructifera 



6. Growth pink. 



a. Gelatin not liquefied. 



37. Nocardia africana 



b. Gelatin liquefied, at first slowly, then completely. 



38. Nocardia pellelieri 



7. Colonies orange-yellow to orange-red, which may change to 

 black. 



39. Nocardia maculata 



8. Pigment on protein media light brown. 



40. Nocardia rhodnii 



9. Pigment on protein media green to greenish brown. 



41. Nocardia gardneri 



