Azoarcus

**Definition:** A genus of gram-negative, facultatively anaerobic bacteria including species which are often associated with grasses (POACEAE) and which fix nitrogen as well as species which anaerobically degrade toluene and other mono-aromatic hydrocarbons.

**Tree numbers:** - B03.440.450.040 - B03.585.101 - B03.660.075.655.070