Has a role in cell separation where it is required for the degradation of the primary septum after completion of cytokinesis. Endohydrolysis of (1->3)- or (1->4)-linkages in beta-D-glucans when the glucose residue whose reducing group is involved in the linkage to be hydrolyzed is itself substituted at C-3. Localized in a ring-like structure around the septum. Decreases basal endo-1,3-beta-glucanase activity. Belongs to the glycosyl hydrolase 81 family.