Endoglucanase that functions in part to hydrolyze 1,3-1,4-beta-glucan during infection and spore formation. Shows preferential hydrolysis of barley beta-glucan and lichenan, but also hydrolyzes carboxymethylcellulose (CMC) to a slight extent. Endohydrolysis of (1->4)-beta-D-glucosidic linkages in cellulose, lichenin and cereal beta-D-glucans. Optimum pH is 6.0-7.5. Optimum temperature is 30-40 degrees Celsius. Expression invreases increased 4-5 days after inoculation, but is not detected during spore formation. The biological conversion of cellulose to glucose generally requires three types of hydrolytic enzymes: (1) Endoglucanases which cut internal beta-1,4-glucosidic bonds; (2) Exocellobiohydrolases that cut the disaccharide cellobiose from the non-reducing end of the cellulose polymer chain; (3) Beta-1,4-glucosidases which hydrolyze the cellobiose and other short cello-oligosaccharides to glucose. Belongs to the glycosyl hydrolase 12 (cellulase H) family.