NOVELTY - Method of storing cellulosic biomass material, comprises: accumulating the cellulosic biomass material into a pile (20) having an average moisture content of 20-50%, where: the pile has an outer surface (22) and an interior; and oxygen is limited in the pile to permit generation of heat within the cellulosic biomass material to attain an interior temperature of 110-175 degrees F and achieve an anaerobic state within the pile.    USE - The method is useful for storing cellulosic biomass material and wet cellulosic feedstock material for its subsequent processing to obtain biochemicals including biofuels (claimed), particularly to the year-round storage of corn cobs to facilitate the production of ethanol from it. The method is useful for the pre-treatment and hydrolysis of cellulose and hemicellulose into sugars and/or fermentation of the resultant sugars into ethanol or other biofuels and biochemicals.    ADVANTAGE - The method is efficient, cost-effective and safe for storing corn cobs and/or other cellulosic biomass having a moisture content of 20-50% in outdoor piles without the creation of excessive levels of organic acids or dry matter loss. The method accumulates the biomass into smooth, uniformly shaped pile having a rounded top to shed rainwater and the outer crust facilitates the shedding of water away from the pile and restricts the passage of air into the pile. In the method: an environment is created within the pile that is largely inhospitable to destructive microbes and which simultaneously causes a minimal lasting inhibitory effect on the beneficial microbes and/or enzymes used to convert the cellulose and hemicellulose into simple sugars; and excessive levels of organic acids and dry matter losses are not created during the long-term storage of the corn cobs. The creation and maintenance of an anaerobic or nearly anaerobic environment in the interior of the pile permits the storage of corn cobs from one season to the next season.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method-2 of storing wet cellulosic feedstock material having a moisture content of 20-50% for its subsequent processing to obtain biochemicals, including biofuels, comprising: (i) accumulating the cellulosic feedstock material into a pile, where sufficient oxygen is incorporated into the pile to permit a generation of heat within the pile to attain an interior temperature of 110-175 degrees F, and achieve a substantially anaerobic state within the pile; and (ii) maintaining the substantially anaerobic state within the pile.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic illustration showing a cross-sectional view of a pile of cellulosic feedstock material.    Pile (20)    Outer surface (22)    Flexible material (25)    First set of perforated pipes (28)    Second set of perforated pipes. (29)