TECHNOLOGY FOCUS - BIOLOGY - Preferred Components: The pellet has a protein:cellulosic material ratio of 6:1-1:10 (w/w), and a DNA:cellulosic material ratio of 1:800-1:50 (w/w). The pellet is a wet pellet, and a dried pellet. The cellulosome-producing microorganism is anaerobic, aerobic, thermophilic, mesophilic, and a bacterium that includes: an anaerobic thermophilic bacterium comprising Clostridium thermocellum, Clostridium clariflavum and Clostridium jo sui; and an anaerobic mesophilic bacterium comprising Clostridium cellulolyticum, Clostridium cellulovorans, Acetivibrio cellulolyticus, Bacteroides cellulosolvens and Ruminococcus sp.. The cellulosome-producing microorganism is a fungus that is an anaerobic, mesophilic fungus comprising Neocallimastix sp., Piromyces sp. and Orpinomyces sp.. The beta -glucosidase is: recombinantly produced by the cellulosome-producing microorganism; and exogenously added to the composition. The exogenously added beta-glucosidase is a thermostable beta -glucosidase. The cellulosic material is purified cellulose, a complex cellulosic material, a pre-treated cellulosic material, and a ligno-cellulosic material comprising wheat straw, switchgrass, corn cob, corn stover, sorghum straw, cotton straw, bagasse, energy cane, hard wood paper, and/or soft wood paper. The ligno-cellulosic material is derived from a plant comprising Populous species, Salix sp., Acacia sp., Tamarix sp., Arundo donax, and/or Miscanthus giganteus. The medium further comprises one or more plant polysaccharides, and pectin. Preferred Method: The method-I further comprises adding the beta -glucosidase to the pellet preparation. The method-II comprises producing the cellulolytic enzyme preparation, and contacting the cellulosic substrate with the cellulolytic enzyme preparation, and further comprises recycling the enzyme composition for one or more successive hydrolyses. The recycling step comprises: contacting a first sample of a cellulosic substrate with the enzyme composition to obtain hydrolysis of the first sample of a cellulosic substrate into hydrolysis products; collecting the hydrolysis products; and contacting a second sample of a cellulosic substrate with the enzyme composition to obtain hydrolysis of the second sample of a cellulosic substrate into hydrolysis products. EXAMPLE - No suitable example given.