1. Department of Biofunctional Chemistry, Faculty of Agriculture, Kobe University, Nada-ku, Kobe 657-8501, Japan
2. Division of Life Science, Graduate School of Science and Technology, Kobe University, Nada-ku, Kobe 657-8501, Japan
3. Miyagi Agricultural College, Sendai 982-0215, Japan
4. The Tottori Mycological Institute, Kogoke, Tottori 689-1125, Japan