| Class | Genus | Species No. | Strain No. |
|---|---|---|---|
| Imbricatea | Abollifer | 1 | 1 |
| Cyanophyceae | Acaryochloris | 2 | 2 |
| Bacillariophyceae | Achnanthes | 2 | 2 |
| Bacillariophyceae | Achnanthidium | 2 | 12 |
| Phaeophyceae | Acinetospora | 1 | 1 |
| Ulvophyceae | Acrochaete | 1 | 1 |
| Trebouxiophyceae | Actinastrum | 1 | 1 |
| Nucleohelea | Actinophrys | 1 | 1 |
| Dinophyceae | Adenoides | 1 | 1 |
| Fornicata | Aduncisulcus | 1 | 1 |
| Ulvophyceae | Aegagropila | 1 | 1 |
| Dinophyceae | Akashiwo | 1 | 3 |
| Pedinophyceae | Akinorimonas | 1 | 1 |
| Dinophyceae | Alexandrium | 6 | 12 |
| Sarcomonadea | Allapsa | 3 | 3 |
| Dinophyceae | Amphidinium | 7 | 14 |
| Cyanophyceae | Anabaena | 2 | 4 |
| Cyanophyceae | Anabaenopsis | 1 | 3 |
| Cyanophyceae | Anacystis | 1 | 1 |
| Variosea | Angulamoeba | 1 | 1 |
| Chlorophyceae | Ankistrodesmus | 5 | 9 |
| Pelagophyceae | Ankylochrysis | 1 | 1 |
| Trebouxiophyceae | Apatococcus | 1 | 1 |
| Cyanophyceae | Aphanizomenon | 3 | 10 |
| Cyanophyceae | Aphanocapsa | 1 | 1 |
| Cyanophyceae | Aphanothece | 1 | 1 |
| Chlorophyceae | Apiocystis | 1 | 1 |
| Trebouxiophyceae | Apricichlorella | 1 | 1 |
| Cyanophyceae | Arthrospira | 2 | 3 |
| Bacillariophyceae | Asterionellopsis | 1 | 2 |
| Trebouxiophyceae | Asterochloris | 1 | 4 |
| Chlorophyceae | Asterococcus | 2 | 3 |
| Dinophyceae | Asterodinium | 1 | 1 |
| Chlorophyceae | Astrephomene | 2 | 9 |
| Dinophyceae | Asulcocephalium | 1 | 1 |
| Bacillariophyceae | Attheya | 1 | 1 |
| Bacillariophyceae | Aulacoseira | 3 | 4 |
| Cyanophyceae | Aulosira | 1 | 1 |
| Labyrinthulea | Aurantiochytrium | 1 | 2 |
| Aurearenophyceae | Aurearena | 1 | 3 |
| Trebouxiophyceae | Auxenochlorella | 1 | 4 |
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