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. Shows higher activities on cellobiose and cellotriose but lower activities on laminarioligosaccharides and polymers. Hydrolysis of terminal, non-reducing beta-D-glucosyl residues with release of beta-D-glucose. Optimum pH is 5.0. Optimum temperature is 40-60 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.