716 ORDER V. ACTINOMYCETALES 



c. Vegetative mycelium white, buff or pale yellow. 



1. Nocardia farcinica. 

 cc. Vegetative mycelium yellow to red. 



2. Nocardia asteroides. 

 bb. Not pathogenic. 



3. Nocardia polychromogenes . 

 aa. Vegetative mycelium white to pink. 



b. Gelatin not liquefied. 



c. Growth on nutrient agar opaque, cream-colored; coccoid forms 

 in broth. 



4. Nocardia opaca. 



cc. Growth on nutrient agar watery; no coccoid forms in broth. 



5. Nocardia erythropolis. 

 ccc. Growth on nutrient agar pink. 



d. Aerial mycelium on milk white. 



6. Nocardia leishmanii. 

 dd. Pellicle on milk pink. 



7. Nocardia caprae. 

 ddd. Pellicle on milk yellow. 



8. Nocardia pretoriana. 

 dddd. Causes galls on blueberry plants. 



9. Nocardia vaccinii. 

 bb. Gelatin liquefied. 



10. Nocardia pulmonalis. 



2. Vegetative mycelium hard, yellow, with white, aerial mycelium; hyphae divide 

 into chains of acid-fast cocci. 



11. Nocardia paraffinae. 



B. Initial mycelium very short, rapidly dividing into rods and cocci. 



1. Slowly growing organisms; cells 0.5 to 0.7 micron in diameter. 



12. Nocardia minima. 



2. Rapidly growing organisms; cells 1.0 to 1.2 microns in diameter. 



a. Growth pink. 



b. No cystites (swollen cells) formed, 

 c. No indigotin from indole. 



13. Nocardia coralUna. 

 cc. Indigotin from indole. 



14. Nocardia globerula. 



bb. Cystites formed. 



aa. Growth coral-red. 



aaa. Growth dark red. 



aaaa. Growth white. 



b. No aerial mycelium. 



15. Nocardia salmonicolor . 



16. Nocardia rubropertincta. 



17. Nocardia rubra. 



18. Nocardia coeliaca. 

 bb. Aerial mycelium. 



19. Nocardia transvalensis. 

 II. Non-acid-fast organisms with weakly refractive cells; diastatic. 



A. Parasitic or soil forms. Not known to digest agar. 

 1. Not proteolytic. 



a. Growth on agar pale cream. 



20. Nocardia mesenterica. 



