Hyphomicrobium  

What you should know:

Hyphomicrobium is a Gram-negative appendaged, budding bacterium. During its reproductive cycle, it grows a hypha (extension) from which a daughter cell buds off. 

Classification: 

Domain Bacteria

    Phylum Proteobacteria  

        Class α - Proteobacteria 

Bergey's Manual Volume 2: The Proteobacteria