sentences:  A complex NADPH oxidase enzyme-based ROS-generating system in "Epichloë" species is indispensable for maintenance of this growth synchrony.Thus, it has been demonstrated that deletion of genes encoding these enzymes in "Epichloë festucae" causes severely disordered fungal growth in grass tissues and even death of the grass plant.Molecular phylogenetic evidence demonstrates that asexual "Epichloë" species are derived either from sexual "Epichloë" species, or more commonly, are hybrids of two or more progenitor "Epichloë" species.