Abstract
Two new species, Erysiphe azerbaijanica on Castanea sativa and E. linderae on Lindera praecox, both belonging to the Microsphaera lineage of the genus Erysiphe are described based on morphological and molecular data. Erysiphe azerbaijanica is distinguished from other Erysiphe species occurring on Castanea spp. by its cylindrical conidia with a length/width ratio of 2–3.6, longer conidiophore, and foot-cells. Molecular analyses indicated that this species forms a clade of its own, supporting the morphological observations. Molecular phylogenetic analyses showed that E. blasti s. lat. is divided into two genetically differentiated groups associated with different host species. Based on the sequence differences in the 28S rRNA gene and ITS region, connected with differences in the number and length of appendages, the fungus on L. praecox is described as a new species, E. linderae.
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