In this study, the effects of different cellulosic wastes on nutritional values Pleurotus ostreatus (Jacq.) P. Kumm. were investigated. Dry matter, moisture, protein, fat and ash contents analyzed according to AOAC methods. Crude protein determined by Kjeldahl method Soxhlet extraction, using ether as a solvent, respectively. Chemical composition such dry crude organic matter 93.5-93.7%, 6.3-6....