Shows activity on lichenan, beta-glucan and laminarin but not on CMC cellulose or xylan. Hydrolysis of (1->4)-beta-D-glucosidic linkages in beta-D-glucans containing (1->3)- and (1->4)-bonds. Optimum pH is 7.0. Optimum temperature is 85 degrees Celsius. Belongs to the glycosyl hydrolase 16 family.