The Ultrastructure of Trichophyton and a Double Cell Wall in the Hypha*

ABSTRACTMany hyphae with double structures consisting of an outer and an inner hypha were demonstrated with an electron and a light microscope when microconidia of Trichophyton mentagrophytes were cultured with shaking in a Sabouraud's broth for 96 hours.It seems that this double structure results from the extension of a septum of the hypha through the interior to form a new “inner” hypha enclosed in the old “outer” hypha