Screening of Fungi for Cellulase Activity. Screenings
of fungi for their cellulase activity were carried out by
the hydrolysis of substrate incorporating in the basal salt
medium. After an incubation period, enzyme activities were
detected by the appearance of zones either by substrate
clearances or coloration and discoloration around the fungal
colonies. A. niger and Trichoderma sp. were showed the
highest zone around the colony, used for further study.