Eleven strains of Epidermophyton floccosum were compared with 5 Micros
porum and 5 Trichophyton species with respect to the restriction fragm
ent length polymorphism (RFLP) of the mitochondrial DNA to reveal thei
r phylogenetic relationships. The phylogeny of 11 species showed that
the three dermatophyte genera could not be separated from each other a
nd could be considered to be congeneric. This result is not inconsiste
nt with the results from ribosomal RNA sequences.