| Genus | Species Num | Strain Num | SOURCE |
|---|---|---|---|
| Polaromonas | 2 | 2 | HMP |
| Polynucleobacter | 1 | 1 | HMP |
| Porphyromonas | 6 | 11 | HMP/MGYG |
| Prescottella | 1 | 1 | HMP |
| Prevotella | 28 | 40 | HMP/MGYG |
| Prevotellamassilia | 1 | 1 | MGYG |
| Priestia | 1 | 2 | HMP |
| Prochlorococcus | 1 | 11 | HMP |
| Propionibacterium | 1 | 2 | HMP/MGYG |
| Prosthecochloris | 1 | 1 | HMP |