(G)rowth and maintenance parameters mu(max) K, m, and Y-m for cellulase biosynthesis on lactose by T. reesei-C5 were estimated and compared with published data on other soluble substrates and mutant strains of T. reesei in continuous culture. Growth was favored at higher feed lactose but cellulase productivities did not increase proportionally, suggesting that a degree of inhibition and/or catabolic repression within the strain is possible. The estimated values of growth kinetics and maintenance parameters varied little but were within a reasonable range of published data on other soluble substrates and mutant strains of T. reesei in continuous cultures.