The empirical rate expression previously proposed for the hydrolysis of avicel and tissue paper by Meicelase from Trichoderma viride also held for the hydrolysis of dewaxing cotton, Whatmann CF-11, Solka Floc SW-40, tissue paper and 1% NaOH-pretreated sawdust by Meicelase, Trichoderma reesei QM9414 or Cellulosin from Aspergillus nigar.