Seolan, a new variety of oyster mushroom was developed by Mushroom Research Institute, Gyonggi Province Agricultural Research and Extension Services in 2005. It was bred with mating between monokaryotic strains isolated from KME35124 and F·X3. The major characteristics of the mushroom are showing a lot of pinheadings, the gray-colored and infundibuliform pileus. The optimum temperature for the mycelial growth was around 26∼30℃ and that for the pinheading and growth of fruitbody was around 10∼15℃. Incubation period was required around 25 days with bottle culture and about 23days in Poly Prophylene(P.P) plastic bag culture. The yield were shown high by 138.8g/bottle and 250.9g/P.P bag.