Endoglucanase that is involved in the biological conversion of cellulose to glucose. Hydrolyses internal beta-1,4-glucosidic bonds. Endohydrolysis of (1->4)-beta-D-glucosidic linkages in cellulose, lichenin and cereal beta-D-glucans. Monomer. Expressed at all stages, however, the highest level appears in mycelia, followed by germinating spores, and the lowest in spores. Expression is increased at 72 h of infection, and then the expression level drops back to the lower level for the remainder of the time course. 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 7 (cellulase C) family.