New records of powdery mildew fungi (Erysiphaceae, ascomycota) and rust fungi (Pucciniales, basidiomycota) for Vietnam

Abstract

For Vietnam, a small number of obligate parasitic fungi are given, in powdery mildew (Erisiphales) and rust fungi (Pucciniales). Basically, these are old lists of species that require confirmation or revision. In 2021, a joint expedition was conducted by the staff of the Joint Vietnam-Russia Tropical Science and Technology Research Centre and the Komarov Botanical Institute (BIN RAS). During this expedition, several new species of parasitic fungi were identified for Vietnam. Among the powdery mildew fungi (Erysiphales): Erysiphe trifoliorum and Pseudoidium cocculus were found in an amorphous state characteristic of the tropical region. Among the rust fungi (Pucciniales), Phragmidium potentillae is a widespread species from the genus Phragmidium on Potentilla spp. and Puccinia oxalidis on Oxalis debilis subsp. corymbosa.