Beta-glucosidases are one of a number of cellulolytic enzymes involved in the degradation of cellulosic biomass. Catalyzes the last step releasing glucose from the inhibitory cellobiose. Has a broad substrate specificity but preferentially hydrolyzes highly polymerized 1,3- and 1,4-beta-glucans. Hydrolysis of terminal, non-reducing beta-D-glucosyl residues with release of beta-D-glucose. Optimum pH is 5.5. Optimum temperature is 50 degrees Celsius. Glycan metabolism; cellulose degradation. The transcript levels are constant during infection. 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 3 family.