CLASSIFICATION OF THE ACTINOMYCETES 31 



1. Well-developed substrate mycelium produced, hyphae forming 

 occasional septae and breaking up into long rods, 20-30 n; 

 colonies form a faint aerial mycelium with straight sporophores; 

 spores cylindrical. 



Nocardia gabritschewski 



2. No aerial mycelium produced, hyphae or substrate mycelium 

 forming frequent septae and breaking up into short rods and 

 cocci Nocardia cyaneus 



II. Red or orange pigment produced. 



1 . Mycelium forming occasional septae and breaking up into long 

 rods ; some give rise to a faint aerial mycelium and short straight 

 sporophores. 



a. Saprophytes. 



a 1 . Cultures not forming any soluble pigment in medium. 



Nocardia fructiferi 

 b 1 . Cultures producing a brown substance. 



Nocardia polychromogenes 



b. Parasites living in bodies of man and animals. 



Nocardia freeri 



2. Hyphae forming frequent septae and breaking up into short 

 rods and cocci; no aerial mycelium produced. 



a. Saprophytes living on dead substrates. 



Nocardia ruber 



b. Parasites living in bodies of man and animals. 

 a 1 . Cells acid-fast 



Nocardia asteroides 

 b 1 . Cells non-acid-fast. 



Nocardia variabilis 

 III. Cultures citron-yellow or bright yellow. 



1 . Faint aerial mycelium with straight sporophores and cylindrical 

 spores produced. 



a. Saprophytes . Nocardia flavescens 



b. Parasites. . . .Nocardia somaliensis 



2. No aerial mycelium produced. 



a. Saprophytes. 



a 1 . Cultures yellow or bright yellow. 



Nocardia flavus 

 b 1 . Cultures citron-yellow. 



Nocardia citreus 



b. Parasites. 



