| Class | Genus | Species No. | Strain No. |
|---|---|---|---|
| Euglenophyceae | Rapaza | 1 | 1 |
| Centrohelea | Raphidiophrys | 1 | 1 |
| Cyanophyceae | Raphidiopsis | 4 | 39 |
| Chlorophyceae | Raphidocelis | 2 | 4 |
| Trebouxiophyceae | Raphidonema | 1 | 1 |
| Dictyochophyceae | Rhizochromulina | 1 | 1 |
| Rhodellophyceae | Rhodella | 1 | 3 |
| Cryptophyceae | Rhodomonas | 8 | 22 |
| Chlorophyceae | Rhysamphichloris | 2 | 5 |
| Cyanophyceae | Rivularia | 1 | 1 |
| Zygnematophyceae | Roya | 1 | 1 |
| Dinophyceae | Rufusiella | 1 | 1 |
| Chlorophyceae | Rusalka | 1 | 1 |
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