Investigators from a number of dermatologic laboratories in this country and elsewhere have observed, from time to time, cutaneous lesions with particular physical characteristics that constitute a special clinical type of ringworm. One such clinical picture was reported by Lewis, Montgomery and Hopper,1in which the specific fungus was isolated and successfully grown in culture. The fungus associated with this disease syndrome they recognized as Trichophyton purpureum (Bang). Another clinical picture of ringworm, exhibiting several types of physical characteristics in this disease syndrome, has been observed by Dowding and Orr2as being due to the fungus designated as Trichophyton gypseum (Bodin). While these two disease pictures may sometimes be readily separated in a clinical diagnosis, the separation cannot always be made with certainty. Often the same fungus may cause several different types of lesions, or the same kind of lesion may be caused by different fungi. In an