| 綱名 | 属名 | 種数 | 株数 |
|---|---|---|---|
| Chlorophyceae | Pandorina | 2 | 12 |
| Sarcomonadea | Paracercomonas | 5 | 5 |
| Trebouxiophyceae | Parachlorella | 1 | 14 |
| Oligohymenophorea | Paramecium | 1 | 1 |
| Chrysophyceae | Paraphysomonas | 1 | 2 |
| Chlorophyceae | Pascherina | 1 | 2 |
| Imbricatea | Paulinella | 1 | 1 |
| Chlorophyceae | Paulschulzia | 1 | 1 |
| Pavlovophyceae | Pavlova | 3 | 9 |
| Chlorophyceae | Pediastrum | 4 | 8 |
| Dictyochophyceae | Pedinella | 2 | 2 |
| Pedinophyceae | Pedinomonas | 1 | 1 |
| Pelagophyceae | Pelagomonas | 2 | 5 |
| Charophyceae | Penium | 1 | 3 |
| Heterolobosea | Percolomonas | 1 | 1 |
| Dinophyceae | Peridinium | 3 | 3 |
| Chlorophyceae | Phacotus | 1 | 2 |
| Prymnesiophyceae | Phaeocystis | 1 | 2 |
| Pinguiophyceae | Phaeomonas | 1 | 1 |
| Cyanophyceae | Phormidesmis | 1 | 2 |
| Cyanophyceae | Phormidium | 7 | 13 |
| Trebouxiophyceae | Picochlorum | 2 | 3 |
| Chrysophyceae | Picophagus | 1 | 1 |
| Placididea | Placidia | 1 | 2 |
| Chlorophyceae | Planctonema | 1 | 1 |
| Chlorophyceae | Planktosphaeria | 1 | 1 |
| Cyanophyceae | Planktothricoides | 1 | 2 |
| Cyanophyceae | Planktothrix | 5 | 21 |
| Bacillariophyceae | Planothidium | 2 | 2 |
| Chlorophyceae | Platydorina | 1 | 2 |
| Cyanophyceae | Plectonema | 1 | 1 |
| Chlorophyceae | Pleodorina | 4 | 13 |
| Prymnesiophyceae | Pleurochrysis | 3 | 3 |
| Charophyceae | Pleurotaenium | 4 | 13 |
| Chlorophyceae | Polyedriopsis | 1 | 1 |
| Porphyridiophyceae | Porphyridium | 3 | 12 |
| Chrysophyceae | Poterioochromonas | 1 | 1 |
| Prasinophyceae | Prasinoderma | 2 | 2 |
| Cyanophyceae | Prochlorococcus | 1 | 2 |
| Dinophyceae | Prorocentrum | 9 | 22 |
| Chlorophyceae | Protodesmus | 1 | 1 |
| Prymnesiophyceae | Prymnesium | 3 | 5 |
| Bacillariophyceae | Psammoneis | 1 | 1 |
| Cyanophyceae | Pseudanabaena | 2 | 4 |
| Ulvophyceae | Pseudendoclonium | 1 | 1 |
| Bacillariophyceae | Pseudo-nitzschia | 1 | 1 |
| Chlorophyceae | Pseudocarteria | 1 | 3 |
| Dictyochophyceae | Pseudochattonella | 1 | 2 |
| Trebouxiophyceae | Pseudochlorella | 1 | 1 |
| Trebouxiophyceae | Pseudococcomyxa | 1 | 1 |
| Chlorophyceae | Pseudodictyosphaerium | 1 | 1 |
| Trebouxiophyceae | Pseudomarvania | 1 | 1 |
| Chlorophyceae | Pseudopediastrum | 1 | 1 |
| Dictyochophyceae | Pseudopedinella | 1 | 2 |
| Trebouxiophyceae | Pseudopleurococcus | 1 | 1 |
| Chlorophyceae | Pseudoschroederia | 1 | 1 |
| Prasinophyceae | Pseudoscourfieldia | 1 | 2 |
| Trebouxiophyceae | Pseudotrebouxia | 1 | 1 |
| Chlorophyceae | Pteromonas | 4 | 7 |
| Prasinophyceae | Pterosperma | 1 | 3 |
| Prasinophyceae | Pycnococcus | 2 | 6 |
| Prasinophyceae | Pyramimonas | 8 | 42 |
| Chlorophyceae | Pyrobotrys | 3 | 8 |
| Dinophyceae | Pyrocystis | 1 | 1 |
| Dinophyceae | Pyrophacus | 2 | 2 |
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