The CTAB method is incredible tedious. I recommend a regular extraction method and then precipitate the polysaccharides based on differential solubility in salt. With DNA in TE, add NaCl to 3M, place on ice to force polysaccharides out of solution. Centrifuge to pellet the goop, collect supernatant, dilute to 0.5 M NaCl and precipitate DNA by adding 2 volumes of ethanol. If you have access to kits, a column-based genomic DNA purification kit is best (Qiagen Genomic-tips).
Grind lyophilized mycelium in lysis buffer (0.1M Tris pH7.5, 0.5 M NaCL, 1% SDS, 10 mM EDTA); perform phenol:chloroform:IAA (25:24:1) extraction; then perform chloroform:IAA (24:1) extraction. Precipitate with 0.54 vols. isopropanol. Dissolve pellet in TE + 10 µg/ml RNAse.