Agaricus bisporus is a delicious, nutritious mushroom with medical function. Cross breeding is limited due to its taxonomic contradiction. We analyzed rDNA ITS sequences of two high quality Agaricus bisporus strains (No.Tb07, As2796). Tb07 strain was selected from foreign mushroom by CSUFT under protection. As2796 strain was a high quality local strain in nature in China. By sequencing the ITS regions and comparing with those sequences from Genebank by BLAST search, the results concluded that the ITS region length of Tb07 strain was 701 bp and ...