A total of 376 Phytophthora isolates representing 142 described and 43 provisionally named species, plus one isolate of each Elongisporangium undulatum (basionym: Pythium undulatum), Halophytophthora fluviatilis, and Phytopythium vexans (basionym: Pythium vexans) as outgroup taxa were included (Table 1). These included 114 ex-types (Table 2). Also included were 164 authentic isolates that were designated as representative isolates by the originators of the respective species names (Table 1). The majority of these isolates were provided by the originators of the respective species, while the rest were purchased from the Westerdijk Fungal Biodiversity Institute (CBS), Utrecht, The Netherlands.