A patient made a self-diagnosis of athlete's foot (tinea pedis) and began using a product advertised on television. The condition improved but did not clear and then the patient showed himself to a Dermatologist. A skin scraping was sent to the laboratory for culture, including culture for fungi. The fungal culture yielded a slow growing colony, which produced a few small microconidia. This is consistent with isolation of a dermatophyte of the genera

Tinea pedis is Dermatophytic infection of plantar aspect of foot Caused by T. rubrum, E. floccosum and T. mentagrophytes. It is frequently seen among individual wearing shoes for long hours. Warmth and moisture produced by shoes are key factors in maintaining infection. Trichophyton spp. generally produces abundant Microconidia with few Macroconidia and Microsporum produces few Microconidia. Even though in this question it is mentioned that the isolate produced few Microconidia, I feel the most appropriate answer is Trichophyton, as Microsporum does not cause T. pedis