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An unrecorded Hypoxylon sp. was observed on the bed-log of oak-mushroom (Lentinula edodes) in Korea. The stroma of the fungus was formed on the bed-log (Quercus spp.) damaged by Korean squirrel (Sciurus vulgaris coreae). Perithecia were 200~400 mm, and asci containing 8 ascospores were 7~8?150~230 mm in size. Paraphysis was cylindrical shape. Ascospores were 5~9?12~17.5 mm in size, pale brown to dark brown, elliptical, and smooth. They have germination cleft and 1-2 oil droplets.