A New High2tempera ture2thermotoleran t Aga ricus bitorqu is Hybr id‘Xiax iu2000’ Biological Effects and ISSR Analysis of 60Co γ-Irradiation on Edible Mushroom Mycelia A New High2tempera ture2thermotoleran t Aga ricus bitorqu is Hybr id‘Xiax iu2000’