NOVELTY - Converting carbonaceous material to methane comprises: (a) treating carbonaceous material comprising hexose and pentose saccharides under a condition to generate a fermentation end product; and (b) contacting the fermentation end product with a second microorganism to produce methane.    USE - The method is useful for converting carbonaceous material to methane, where methane is isolated for use as fuel (all claimed); and for improving methane production and alternatively one or more additional product.    DETAILED DESCRIPTION - Converting carbonaceous material to methane comprises: (a) treating carbonaceous material comprising hexose and pentose saccharides under a condition to generate a fermentation end product, where the one or more conditions comprise contacting the biomass with: (i) a first microorganism that can hydrolyze and ferment hexose and pentose saccharides; (ii) a medium in which the first microorganism has been cultured, (iii) one or more hydrolytic enzymes from the first microorganism; or (iv) a combination of any of (i)-(iii); and (b) contacting the fermentation end product with a second microorganism to produce methane; or converting carbonaceous material to methane comprises: (a) treating carbonaceous material comprising hexose and pentose saccharides under a condition to generate a fermentation end product, where the one or more conditions comprise contacting the biomass with: (i) Clostridium phytofermentans; (ii) a medium in which the Clostridium phytofermentans has been cultured; (iii) one or more hydrolytic enzymes from the Clostridium phytofermentans; or (iv) a combination of any of (i)-(iii); and (b) contacting the fermentation end product with a second microorganism to produce methane. INDEPENDENT CLAIMS are: (1) an anaerobic methane digester comprising: (i) a biomass comprising hexose and pentose saccharides; (ii) a first microorganism that can hydrolyze and ferment hexose and pentose saccharides; a medium in which the first microorganism has been cultured; one or more hydrolytic enzymes from the first microorganism; or its combination; and (iii) a second microorganism that produces methane; (2) an anaerobic methane digester comprising: (i) a comprising hexose and pentose saccharides; (ii) Clostridium phytofermentans, a medium in which Clostridium phytofermentans has been cultured, one or more Clostridium phytofermentans hydrolytic enzyme, or its combination; and (iii) a microorganism selected from Methanobrevibacter; Methanobacterium; Methanosarcina; Methanosarcina; and Methanomicrobium; and (3) a biogas comprising methane produced by converting carbonaceous material to methane, comprising: (a) treating carbonaceous material comprising hexose and pentose saccharides under a condition to generate a fermentation end product, where the one or more conditions comprise contacting the biomass with: (i) Clostridium phytofermentans, a medium in which the Clostridium phytofermentans has been cultured, one or more hydrolytic enzymes from the Clostridium phytofermentans, or its combination; and (b) contacting the fermentation end product with a second microorganism to produce methane.