Wood blocks (Cryptomeria japonica) which were decayed by a Polyporales white-rot fungus (Trametes versicolor) and brown-rot fungi (Fomitopsis palustris, F. pinicola, and Wolfiporia cocos), respectively, were analyzed by X-ray diffraction and infrared spectroscopic methods followed by multivariate analysis. In the analyses, the differences in the cellulose crystallinities and infrared spectral patterns were observed between Polyporales white-rot and brown-rot fungi. Multivariate analysis of the infrared spectroscopy data also suggested the difference of chemical component between wood blocks decayed by Polyporales white-rot and brown-rot fungi. In addition, when wood blocks decayed by brown-rot fungi belonging to Polyporales (F. palustris), Gloeophyllales (Gloeophyllum trabeum, and Neolentinus, suffrutescens), and Boletales (Coniophora puteana) were analyzed by FT-IR followed by multivariate analysis, the plot pattern of initial decay stage of C. puteana was significantly distinct from those of other brown rot fungi.

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