Promotes the release of ascospores from asci by hydrolyzing 1,3-beta-glucan in the ascus wall. 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. Present during vegetative growth at low level (at protein level) (PubMed:19542306). The level increases throughout meiosis and reaches its highest during sporulation (at protein level) (PubMed:19542306). Severely decreases occurrence of ascospore release from ascus during sporulation (PubMed:19542306). Decreases sporulation-specific endo-1,3-beta-glucanase activity (PubMed:19542306). Belongs to the glycosyl hydrolase 81 family.