Glycosyltransferase involved in the maintenance of the outermost surface of the fungal cell wall (PubMed:29020037). Likely functions in the synthesis of a currently unknown, potentially minor but widespread, extracellular or outer cell wall polysaccharide which plays a key role in facilitating many interactions between plants and fungi by enabling hyphal growth on solid matrices (PubMed:29020037). Expression is induced during hyphal growth. Severely impairs hyphal growth and pathogenicity on wheat leaves (PubMed:29020037). Does not affect adhesion to leaf surfaces (PubMed:29020037). Leads to constitutive overexpression of several transmembrane and secreted proteins, including an important LysM-domain chitin-binding virulence effector, LysM (PubMed:29020037). Belongs to the GT2 glycosyltransferase family.