FAMILY ACHRO.MOBACTERL^CEAE 417 



Genus II. Achromobacter Bergey et al.* 



(Bergey et al., Manual, 1st ed., 1923, 132; Achromobacterium Richards, Proc. 

 Soc. Agr. Bact. (British), 15th Ann. Conf., 1944, 14.) From Greek achroma, with- 

 out color and bactrum, a staff or rod. 



Xon-pigment -forming (at most no pigment formed on agar or gelatin) rods. Motile 

 with peritrichous flagella or non-motile. Gram-negative to Gram-variable. Litmus 

 milk faintlj^ acid to unchanged or alkaline. Occur in salt to fresh water and in soil. 



The type species is Achromobacter liquefaciens (Eisenberg) Bergey et al. 



Key to the species of geiius Achromobacter. 

 I. Motile. Flagella peritrichous. 



A. Gelatin liquefied. 



1. Litmus milk unchanged. 



a. Nitrites not produced from nitrates. 



1. Achromobacter liquefaciens. 

 aa. Nitrites are produced from nitrates. 



2. Achromobacter thalassius. 



3. Achromobacter iophagum. 



2. Litmus milk acid. 



a. Nitrites are produced from nitrates. 



4. Achromobacter delicatulutn. 



B. Gelatin not liquefied. 



1. Litmus milk unchanged. 



a. Nitrites are produced from nitrates. 



5. Achromobacter aquamarinus. 



6. Achromobacter cycloclastes . 



2. Litmus milk slightly acid. 



a. Nitrites not produced from nitrates. 



7. Achromobacter superficiale. 



II. Non-motile. 



A. Gelatin liquefied. 



1. Litmus milk unchanged. 



a. Nitrites slowly produced from nitrates. 



8. Achromobacter stenohalis. 

 aa. Nitrites not produced from nitrates. 



9. Achromobacter butyri. 



2. Litmus milk alkaline. 



a. Nitrites are produced from nitrates. 



10. Achromobacter stationis. 



B. Gelatin not liquefied. 



1. Litmus milk unchanged. 



a. Action on nitrates not recorded. 



11. Achromobacter eurydice. 



2. Litmus milk acid, reduced in 5 days. 



a. Nitrites are produced from nitrates. 



12. Achromobacter delmarvae. 



* Partially rearranged before his death by Prof. D. H. Bergey, Philadelphia, Penn- 

 sylvania, September, 1937; further revision by Prof. Robert S. Breed, New York 

 State E.xperiment Station, Geneva, New York, August, 1945. 



