In order to utilize the agricultural waste products for animal feeds, studies have been made concerning the production of cellulose of Irpex lacteus and its properties of crude enzyme, and summarized as follows. 1. At the production of cellulose, the culture of wheat bran added with rice bran was more active than any other cultures. 2. The optimum incubation time is 5 days in shaking culture. 3. The optimum condition of reaction in saccharification with CMC were obtained the following results. 1) The optimum pH was within the range of from 3.5 to 4.0 and stable within 3.0 to 6. 0. 2) The optimum temperature was 40℃ and thermal stability was below 40℃. 3) The optimum reaction time was 2 hours. 4) The optimum crude enzyme concentration was 50%V/V and substrate concentration 1%.