Morphology and phylogeny of Cytospora (Cytosporaceae, Diaporthales) species associated with plant cankers in Tibet, China

During our biodiversity investigations in Tibet, China, typical Cytospora canker symptoms were observed on branches of hosts Myricariapaniculate, Prunuscerasifera and Sibiraeaangustata. Samples were studied, based on morphological features coupled with multigene phylogenetic analyses of ITS, act, rpb2, tef1 and tub2 sequence data, which revealed two new species (Cytosporamyricicolasp. nov. and C.sibiraeicolasp. nov.) and a known species (C.populina). In addition, Cytosporapopulina is newly discovered on the host Prunuscerasifera and in Tibet.