Formal description of Phytophthora novae‐guineae sp. nov., a Clade 5 species

During a systematic survey for Phytophthora in forest and agricultural soils in Papua New Guinea, carried out in the 1970 s and 1980s, two Clade 5 species, identified as P. heveae and P. castaneae , were recovered. Subsequent genetic analysis of two of the isolates that had been identified as P. castaneae confirmed that these isolates were distinct and represented a new species, tentatively named Phytophthora sp. "novaeguineae", a nomen nudum as there is no formal description. Based on data collected during the systematic survey, the species is now formally described as P. novae‐guineae .