18 tested Agrocybe aegerita strains( 4 wild strains,7 factory cultivation strains,5 Cobalt-60 irradiation induced strains,2 aerospace mutation strains carried by the Shenzhou 10 spacecraft) by ITS sequence analysis were studied. The results showed that the lengths of ITS sequences of Agrocybe aegerita strains were 703- 721 bp,and their ITS sequence similarity in the Gen Bank database was more than 99%,which indicated that the tested strains were Agrocybe aegerita at the specific level. Phylogenetic tree was...