Abstract
Dermatophytes are classified according to two systems. The first, or parasitic classification of Sabouraud, rests on the morphology of the dermatophytes on the hair in vivo (Achorion, Trichophyton endothrix or ectothrix microides and megaspores, Microsporum) or on the absence of growth on the hair in vivo (Epidermophyton). In the second type they are classified according to their saprophytic morphology. There are many classifications of this type based on the asexual state of the dermatophytes, e.g. the classification of Emmons (Trichophyton, Microsporum, Epidermophyton) or the classification of Vanbreuseghem and DeVroey (Microides, Trichophyton, Microsporum, Epidermophyton, Keratinomyces). As the existence of a sexual state of the dermatophytes has been demonstrated, the dermatophytes are also classified in two perfect genera: Arthroderma and Nannizzia. In this paper it is assumed that both classifications have to be used because they are not correlated.

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