Lysis of cellular walls containing beta-1,3-glucans. Implicated in the defense against fungal pathogens (By similarity). Hydrolysis of (1->3)-beta-D-glucosidic linkages in (1->3)-beta-D-glucans. Predicted to be exported by the Tat system. The position of the signal peptide cleavage has not been experimentally proven. Belongs to the glycosyl hydrolase 64 family.