Probable glycosidase that plays a role in cell wall architecture. Required for the transfer of chitin to 1,6-beta-glucan in the cell wall. Covalently-linked GPI-modified cell wall protein (GPI-CWP), localized particularly in chitin-rich areas. Localizes to sites of polarized growth. Found at the incipient bud site, as a ring at the bud neck as the bud grows, and in the septum at the time of cytokinesis. Redistributes uniformly over the cell cortex upon heat stress. The GPI-anchor is attached to the protein in the endoplasmic reticulum and serves to target the protein to the cell surface. There, the glucosamine-inositol phospholipid moiety is cleaved off and the GPI-modified mannoprotein is covalently attached via its lipidless GPI glycan remnant to the 1,6-beta-glucan of the outer cell wall layer. Belongs to the glycosyl hydrolase 16 family.