Two hundred and three isolates representing 15 species of filamentous ascomycetes were evaluated against terbinafine and itraconazole using a modification of the NCCLS M27-A standard reference method for yeasts. The MIC ranges and geometric means were similar, although terbinafine tended to have the lowest values. The loculoIascomycete clade tested had consistently low MIC geometric mean values for its members, ranging from 0.03 to 0.17 microg ml-1 for terbinafine and 0.03-0.37 microg ml-1 for itraconazole.