TECHNOLOGY FOCUS - BIOLOGY - Preparation: No preparation method is given. Preferred Components: The bacterium grows on untreated plant biomass, and lignocellulose as the sole carbon source. The minicellulosome comprises at least three cellulolytic enzymes, and all of the enzymes are encoded by the bacterium. The protein encoding two or more cohesin domains comprises a secretory signal sequence at the N-terminus and a cell wall sorting signal (CWSS) at the carboxyl terminus. The cell wall sorting signal comprises a Leu-Pro-X-Thr-Gly motif, where X is any amino acid. The CWSS is obtained from Staphylococcus aureus fibronectin binding protein B. The secretory signal sequence comprises a Bacillus subtilis phrC secretory signal or its homologue, and a secretion signal derived from the Bacillus subtilis phrC. The cohesin domains: encode a carbohydrate binding module (CBM) that is a family 3 carbohydrate binding module; are type I cohesin modules; and are obtained from different microorganisms comprising Clostridium thermocellum, Clostridium cellulolyticum, Ruminococcus flavefaciens, C. cellulovorans, C. acetobutylicum, C. josui, C. papyrosolvens, A. cellulolyticus, R. albus, and Ruminococcus flavefaciens. The cellulolytic enzyme(s) on dormant bacteria are stable for at least 1 day, preferably at least 3 days. The cellulolytic enzyme(s) comprise one or more enzymes comprising an endocellulase, an exocellulase, a beta -glucosidase (cellobiase), an oxidative cellulase, a xylanase, a hemicellulase, a lichenase, a chitenase, and a cellulose phosphorylase. The mini-cellulosome comprises at least two different cellulolytic enzymes, preferably at least three different cellulolytic enzymes, at least two endoglucanases, at least one exoglucanase, Clostridium cellulolyticum endoglucanase Cel5A, Clostridium cellulolyticum endoglucanase cellulase ((Cel)48F), and Clostridium cellulolyticum exoglucanase cellulase ((Cel)9E). The Gram-positive bacterium encodes a sortase, and comprises a thermophilic Geobacillus spp.. The cellulosic biomass comprises lignocellulosic biomass, and one or more materials comprising an agricultural plant waste (e.g., com stover, cereal straw, sugarcane bagasse), a plant waste from an industrial process (e.g., sawdust, paper pulp), a non-food energy crop (e.g., switchgrass), grasses, rice hulls, bagasse, jute, hemp, flax, bamboo, sisal, abaca, straw, com cobs, com stover, alfalfa, hay, coconut hair, seaweed, and algae. The cellulolytic enzyme(s) and/or the cellulolytic enzyme variants comprise a mutant cellulolytic enzyme comprising a mutant cellulase. The cell wall sorting signal comprises a sequence of SEQ ID NOs: 2-10 (one of 11 (33-37) amino acid sequences all fully defined in the specification). Preferred Method: The contacting step comprises contacting dormant bacteria to the cellulosic biomass, and culturing the bacteria with the cellulosic biomass. The cellulosic biomass is not acidified and/or enzymatically pre-digested. EXAMPLE - No suitable example given.