show Abstracthide AbstractPowdery mildew (PM) is one of the most important and widespread plant diseases caused by obligate biotrophic Ascomycete fungi in the order of Erysiphales. Monocot PM fungi such as Blumeria graminis f.sp. hordei (Bgh) infectious on barley and B. graminis f.sp. tritici (Bgt) infectious on wheat exhibit high-level of host-specialization. By contrast, many dicot PM fungi display rather broad host ranges. To understand why different PM fungi adopt distinct modes of host-adaption, we sequenced the genomes of four dicot PM strains belonging to Golovinomyces cichoracearum (GcC1, GcM1, GcM3) or Oidium neolycopersici (OnM2) and conducted comparative sequence analyses. This bioproject included the sequencing and assembly information of GcM1 which is found on sow thistle plants grown on the Shady Grove campus of University of Maryland.