for transmission electron microscopy (TEM) analysis, the mycelium and spores were harvested from R2YE ager. the cells were fixed with freshly made 2% glutaraldehyde in phosphate buffer for 2 hours and washed with PBS three times;then, thesamples fixed with 1% osmium tetroxide and washed with PBS three times. the cells were embedded in Spur resin after dehydeation with ethanol. sections were examined with an H7650/Hitachi H-7000 FA transmission electron microscopy.
For scanning electron microscopy (SEM),about 5- by 5- or 10- by 10-mm pieces made from coverslips were laid flat on R2YE agar before the agar solidified. A little medium was added to the edges of the edges of the coverslips, and spores were inoculated at the edges . After sporulation, the samples were fixed with 1% osmium tetroxide for 3 hours . the samples were then examined with the JSM6390 scanning electron microscopy after being sputter coated with gold.