“…Recent studies using molecular techniques revealed that bacterial endosymbionts inhabit early diverging fungal lineages, such as Mucoromycota (Spatafora et al, 2016;Bonfante and Desirò, 2017). These bacterial endosymbionts were known as endofungal or endohyphal bacteria and mostly related to the family Burkholderiaceae, and, thus, were termed Burkholderia-related endobacteria (Bonfante and Desirò, 2017) or Burkholderiaceae-related endobacteria (BRE) (Takashima et al, 2018b). BRE were generally found in hyphae and asexual spores (Lumini et al, 2007;Sato et al, 2010;Ohshima et al, 2016;Mondo et al, 2017;Takashima et al, 2018a) as well as in sexual spores (Mondo et al, 2017).…”