| Class | Genus | Species No. | Strain No. |
|---|---|---|---|
| Trebouxiophyceae | Nannochloris | 2 | 5 |
| Eustigmatophyceae | Nannochloropsis | 2 | 3 |
| Bacillariophyceae | Navicula | 1 | 1 |
| Florideophyceae | Nemalionopsis | 1 | 36 |
| Bacillariophyceae | Neobrightwellia | 1 | 1 |
| Chlorophyceae | Neochlorosarcina | 1 | 1 |
| Chlorophyceae | Neodesmus | 1 | 1 |
| Sarcomonadea | Neoheteromita | 1 | 1 |
| Nephroselmidophyceae | Nephroselmis | 7 | 20 |
| Zygnematophyceae | Netrium | 3 | 5 |
| Charophyceae | Nitella | 12 | 22 |
| Charophyceae | Nitellopsis | 1 | 2 |
| Bacillariophyceae | Nitzschia | 5 | 17 |
| Cyanophyceae | Nodosilinea | 1 | 1 |
| Cyanophyceae | Nodularia | 1 | 2 |
| Chlorarachniophyceae | Norrisiella | 1 | 1 |
| Cyanophyceae | Nostoc | 6 | 21 |
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