Glucanases play a role in cell expansion during growth, in cell-cell fusion during mating, and in spore release during sporulation. This enzyme may be involved in beta-glucan degradation. Active on laminarin and lichenan (By similarity). Hydrolysis of (1->3)-beta-D-glucosidic linkages in (1->3)-beta-D-glucans. Belongs to the glycosyl hydrolase 17 family. Lacks the conserved Glu residue in position 619 essential for glucanase activity. Its enzyme activity is therefore unsure.