SUMMARYThe effect of sodium chloride on the cellulolytic ability of 16 species ofAspergillusisolated from salt-affected areas of Punjab, Pakistan was studied. Sodium chloride had, in general, an inhibitory effect on cellulolytic ability. However,A. ochraceusshowed a marked increase in cellulolytic ability andA. oryzae, A. nidulansandA. sydowishowed a slight increase in cellulolytic ability at lower concentrations of NaCl.Aspergillus terreuswas the most salt tolerant, showing the maximum cellulolytic ability at levels of NaCl tested. However,A. luchuensiswas the most efficient cellulose decomposer in the absence of NaCl.