364 APPENDIX A 



1. Milk coagulated. 



Ps. aeruginosa (Schroeter) Mig. 



2. Milk not coagulated. 



P$. ftuorescens (Fluegge) Mig. 

 II. Gelatin not liquefied. 



1. Milk rendered alkaline. 



Ps. syncyanea (Ehrenb.) Mig. 



2. Milk reaction not changed. 



Ps. putrida (Fluegge) Mig. 



Cells cylindrical, more or less spirally curved, without endospores; actively 



motile, flagella attached to the poles (microspira) . 

 A. Liquefy gelatin. 



I. Produce indol in 24 hours. 



1. Very pathogenic to pigeons.. 



Microspira Metschnikovi (Gamaleia) Mig. 

 Microspira $c7mt//A;t7/tewsis( Abbott) Chester. 



2. Not distinctly pathogenic to pigeons. 



Microspira comma (Koch) Schroeter. 



II. Little or no indol in 24 hours. 



Microspira Finklerii Schroeter 



Cells in their ordinary form long branched filaments; cultures generally have 

 a mouldy appearance. 



A. Gelatin liquefied. 



Streptothrix bovis (Harz) Chester. 



B. Gelatin not liquefied. 



I. No distinct pigment on gelatin or agar. 



Streptothrix farcinica Rossi-Doria. 



II. Growths on gelatin or agar become reddish. 



Streptothrix madurae Vincent. 

 Threads without distinct sheaths. 



A. Without sulphur grains. 



Lepothrix buccalis Miller. 



B. With sulphur granules, motile, not attached. 



Beggiato alba (Vaucher) Trevisan. 



Threads with sheaths. 



A. Without sulphur granules. 



I. Without pseudodichotomous branching. 



Crenothrix polyspora Cohn. 



II. With pseudodichotomous branching. 



1. Growths on gelatin whitish but gelatin stained brown. 



Cladothrix dichotoma Cohn. 



2. Gelatin not stained brown, colonies floccose filamentous. 



Cladothrix intrica Eussell. 



B. With sulphur granules. 



Thiothrix tenuissima Winogradsky. 



