| Order | Family | Genus | Species |
|---|---|---|---|
| Albuginales | 1 | 3 | 109 |
| Anisolpidiales | 1 | 1 | 2 |
| Ducellieriales | 1 | 1 | 1 |
| Lagenidiales | 2 | 8 | 73 |
| Leptomitales | 1 | 7 | 17 |
| Myzocytiopsidales | 2 | 3 | 20 |
| Olpidiopsidales | 1 | 1 | 6 |
| Peronosporales | 4 | 27 | 1629 |
| Pythiales | 2 | 9 | 950 |
| Rhipidiales | 1 | 3 | 4 |
| Saprolegniales | 1 | 20 | 624 |
| Sclerosporales | 1 | 1 | 1 |