| Genus | Species Num | Strain Num | SOURCE |
|---|---|---|---|
| Methylococcus | 1 | 1 | HMP |
| Methylophaga | 1 | 1 | HMP |
| Methylorubrum | 2 | 4 | HMP |
| Methylosinus | 1 | 1 | HMP |
| Methylotenera | 2 | 2 | HMP |
| Methylovorus | 1 | 1 | HMP |
| Micrococcus | 1 | 3 | HMP/MGYG |
| Microcystis | 1 | 1 | HMP |
| Micromonospora | 2 | 2 | HMP |
| Microscilla | 1 | 1 | HMP |