| Class | Genus | Species No. | Strain No. |
|---|---|---|---|
| Chrysophyceae | Mallomonas | 1 | 1 |
| Mamiellophyceae | Mamiella | 2 | 3 |
| Mamiellophyceae | Mantoniella | 1 | 1 |
| Pedinophyceae | Marsupiomonas | 1 | 2 |
| Cyanophyceae | Mastigocladus | 1 | 2 |
| Thecofilosea | Mataza | 1 | 1 |
| Bacillariophyceae | Mayamaea | 3 | 4 |
| Chlorophyceae | Medakamo | 1 | 1 |
| Cyanophyceae | Merismopedia | 2 | 3 |
| Raphidophyceae | Merotricha | 1 | 1 |
| Dictyochophyceae | Mesopedinella | 1 | 1 |
| Mesostigmatophyceae | Mesostigma | 1 | 5 |
| Zygnematophyceae | Mesotaenium | 2 | 3 |
| Chlorophyceae | Messastrum | 1 | 1 |
| Trebouxiophyceae | Micractinium | 4 | 5 |
| Zygnematophyceae | Micrasterias | 6 | 11 |
| Cyanophyceae | Microchaete | 1 | 1 |
| Eustigmatophyceae | Microchloropsis | 1 | 1 |
| Cyanophyceae | Microcystis | 1 | 372 |
| Chlorophyceae | Microglena | 3 | 3 |
| Mamiellophyceae | Micromonas | 3 | 15 |
| Cyanophyceae | Microseira | 1 | 1 |
| Trebouxiophyceae | Microthamnion | 1 | 1 |
| Bacillariophyceae | Minidiscus | 1 | 1 |
| Xanthophyceae | Mischococcus | 1 | 1 |
| Chlorophyceae | Monactinus | 1 | 1 |
| Mamiellophyceae | Monomastix | 1 | 2 |
| Chlorophyceae | Monoraphidium | 6 | 11 |
| Chlorophyceae | Mychonastes | 3 | 9 |
| Trebouxiophyceae | Myrmecia | 1 | 1 |
| Cyanophyceae | Myxosarcina | 2 | 2 |
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