Abstract
An attempt was made to elucidate the trace metal requirements of two strains of Trichophyton mentagrophytes and two of T. rubrum . Adsorption of the metals with CaCO 3 was found to be the most efficient of the recognized methods for the removal of these elements from a medium containing a complex nitrogen source. No species difference in the Fe, Zn, Mn and Cu requirements of the fungi was indicated by the effect of deficiency of these metals on the weight of the mycelial mat, but three of the strains were shown to be very sensitive to Fe deficiency, three to Zn deficiency and one T. rubrum strain to Mn deficiency as well. The red pigment of this strain became bright yellow in Mn deficient medium. No very marked changes in morphology were noted.
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