Cellulases have enormous potential in industries and are used in food, beverages, textile, laundry, paper and pulp industries etc. Although a large number of microorganisms are capable of degrading cellulose, only a few of these microorganisms produce significant quantities of cell-free enzymes capable of completely hydrolysing crystalline cellulose in vitro. Fungi are the main cellulase-producing microorganisms, though a few bacteria and actinomycetes have also been recently reported to yield cellulase activity. Generally, fungi produces three major types of cellulolytic enzyme:...