Light micrograph of pure cellulose Pine fibres used as a natural material in the making of textiles. Cellulose is a complex carbohydrate found in the cell wall of higher plants, and the most abundant substance found in the plant kingdom. Molecules of cellulose are organized into long, unbranched microfibrils which can be prepared as pure fibres for textile manufacture. For example, linen is made from the cellulose fibres of the flax plant.