TECHNOLOGY FOCUS - BIOLOGY - Preferred Cell: The oleaginous bacterial cell further comprises genes encoding cellobiose sugar transporters. The cell belongs to genus Rhodococcus, preferably species Rhodococcus opacus. The oleaginous bacterial cell further modifies the lipid production pathway.    TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Components: The endocellulase activity is selected from: (a) endoglucanases, beta-glucanases, and xylanases; (b) enzymes belonging to class EC 3.2.1.4., EC 3.2.1.6 and EC 3.2.1.8; and/or (c) a polypeptide comprising an amino acid sequence having at least 70% identity to polypeptide having amino acid sequence containing 449 amino acids as given in the specification (SEQ ID NO: 1) (CenA), amino acid sequence containing 1045 amino acids as given in the specification (SEQ ID NO: 3) (CenB), amino acid sequence containing 1101 amino acids as given in the specification (SEQ ID NO: 5) (CenC) or amino acid sequence containing 441 amino acids as given in the specification (SEQ ID NO: 11) (Cel6A); or a polypeptide encoded by a nucleotide having oligonucleotide sequence containing 1350 base pairs as given in the specification (SEQ ID NO: 2) (cenA), oligonucleotide sequence containing 3138 base pairs as given in the specification (SEQ ID NO: 4) (cenB), oligonucleotide sequence containing 3306 base pairs as given in the specification (SEQ ID NO: 6) (cenC) and/or oligonucleotide sequence containing 1326 base pairs as given in the specification (SEQ ID NO: 12) (cel6A). The exocellulase activity is selected from: (a1) cellulose 1,4- beta -cellobiosidases and 1,4- beta -glucan cellobiohydrolases; (b1) enzymes belonging to class EC 3.2.1.91 or EC 3.2.1.74; and/or (c1) a polypeptide comprising an amino acid sequence having at least 70% identity to polypeptide having amino acid sequence containing 484 amino acids as given in the specification (SEQ ID NO: 9) (Cex) or amino acid sequence containing 872 amino acids as given in the specification (SEQ ID NO: 7) (CbhA); or a polypeptide encoded by a nucleotide having oligonucleotide sequence containing 1455 base pairs as given in the specification (SEQ ID NO: 10) (cex) and/or oligonucleotide sequence containing 2619 base pairs as given in the specification (SEQ ID NO: 8) (cbhA). The cellobiase activity is selected from: (a2) cellobiases, beta -glucosidases and beta -galactosidases; and (b2) enzyme belonging to class EC 3.2.1.21; and/or (c2) a polypeptide (having cellulolytic activity) comprising an amino acid sequence having at least 70% identity to polypeptide having amino acid sequence containing 484 amino acids as given in the specification (SEQ ID NO: 17) (BglC); and/or a polypeptide encoded by a nucleotide having oligonucleotide sequence containing 1455 base pairs as given in the specification (SEQ ID NO: 18).    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The bacterial strain secreting cellulolytic activity in step (2a) and the oleaginous strain of step (4a) are cultivated sequentially. The bacterial strain secreting cellulolytic activity in step (2a) and the oleaginous strain of step (4a) are cultivated simultaneously in the same culturing medium. The bacterial strain secreting cellulolytic activity in step (2a) secretes endoglucanase and exoglucanase activities and oleaginous cell according to step (5a) expresses cellobiase activity. The oleaginous strain according to step (5a) further expresses transporter(s) for cellobiose intake. The bacterial strain secreting cellulolytic activity in step (2a) is the oleaginous cell of step (4a). In the method (M1), at least 10% (preferably 30%) of the carbon source is in cellulosic form, where the carbon source is pretreated cellulose. EXAMPLE - No suitable example given.