Abstract
On identifying the phytolith of the leaves, XRD method is often used. Unless any process is performed, dried and powdered leaves are mostly consist of small fragments of cellulose and amorphous silica. They cause the great amount of background intensity which obscures the small diffracted peaks. Trial experiments for the reduction of these great noises were done applying the centrifugal separation and the decomposition of cellulose by the enzyme "cellulase". The process for Thelypteris viridifrons, a kind of common fern, gave successful result. Although no diffracted peaks had been observed for the non-processed samples, many peaks were revealed after the centrifugation and the decomposition of cellulose, which belonged to whewellite and weddellite. These processes were demonstrated to be very useful for the study of phyto-biomineralogy.
