Trees of the Quercus genus are distributed across the southern regions of South Korea including Jeju-do as well as Japan and China. The genus consists of five species: Quercus myrsinifolia, Quercus gilva, Quercus acuta, Quercus glauca, and Quercus salicina . These trees are recognized as the recommen-ded species for afforestation against global warming, while their distribution has extended to the regions in the northern hemisphere due to global warming (Kira, 1991). Among the five species, Q. gilva is mostly planted as a garden tree or used as a material for window frames and handles. In addition, the acorns of the Quercus trees have long been used as an ingredient of acorn jelly for food in the southern regions according to