Oomycete families

Peronosporaceae are a family of water moulds that contains 21 genera, comprising more than 600 species. Most of them are called downy mildews.

Pythiaceae is a family of oomycetes. The family includes serious plant and animal pathogens in the genus Pythium. The family was circumscribed by German mycologist Joseph Schröter in 1893.

Albuginaceae is a family of oomycetes.

Saprolegniaceae is a family of freshwater mould. James Ellis Humphrey (1861-1897), an American mycologist did significant work on this family.