This contribution is offered, largely, as a result of being a victim of ringworm of the nails for about thirty-five years. A final demonstration of its true nature and successful treatment has stimulated an interest in the fungi responsible for ringworm in this country, particularly the varieties that attack the nails. Of perhaps greatest interest to the dermatologist have been some of the more obscure types of the disease, particularly of the hands and feet, conditions in many cases previously attributed to other causes. Owing to the rarity of the nail affection and greater difficulty of growing cultures from nail parings, comparatively little is known as to the species of fungi responsible for onychomycosis. This is particularly true in this country where systematic study of these fungi has been very much neglected. The frequency of the nail affection, especially in the south, warrants, it is believed, a preliminary report of