How Saprolegniales became successful parasites

What are the Saprolegniales?The Saprolegniales (Oomycota) are eukaryotic filamentous microorganisms that belong to the SAR supergroup (Stramenopiles, Alveolata, and Rhizaria), which includes numerous economically and ecologically relevant organisms [1].Traditional estimates suggested that the order comprises between 150 and 250 species [2].However, our recent survey of Mycobank and the literature since 1970 identifies approximately 300 described species within the order.This number likely represents an overestimate, as many taxa have not been rediscovered since their original description.Moreover, molecular sequence data is currently available for only about 120 species (approximately 40%), leaving a significant portion of their diversity in taxonomic uncertainty.