Multiseptate macroconidia with round end cells are recovered from a strain ofTrichophyton gallinae under the effect of CO2. They possess an elongated form with thin and smooth walls. Their pediculation is not clearly manifested. They display a morphology similiar to the macroconidia ofTrichophyton quinckeanum, Trichophyton megnini, Trichophyton rubrum, Trichophyton violaceum, Trichophyton equinum andTrichophyton verrucosum, differing from those ofCtenomyces.