| Genus | Species Num | Strain Num | SOURCE |
|---|---|---|---|
| Mesorhizobium | 2 | 2 | HMP |
| Metamycoplasma | 2 | 3 | HMP/MGYG |
| Methanobrevibacter | 3 | 4 | MGYG |
| Methanomassiliicoccus | 2 | 2 | MGYG |
| Methanosphaera | 2 | 3 | HMP/MGYG |
| Methylacidiphilum | 1 | 1 | HMP |
| Methylibium | 1 | 1 | HMP |
| Methylobacillus | 1 | 1 | HMP |
| Methylobacterium | 2 | 2 | HMP |
| Methylocella | 1 | 1 | HMP |