Introduction: Potential of Cellulosic Ethanol.- Sources for Lignocellulosic Raw Materials for the Production of Ethanol.- The Pretreatment Step in Lignocellulosic Biomass Conversion: Current Systems and New Biological Systems.- The Saccharification Step: Trichoderma Reesei Cellulase Hyper Producer Strains.- The Saccharification Step: the Main Enzymatic Components.- Extremophilic (Hemi)cellulolytic Microorganisms and Enzymes.- The Alcohol Fermentation...