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The page below is a sample from the LabCE course Fungal Infections in Humans. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Dermatophytes (Epidermophyton, Microsporum, Trichophyton)

Trichophyton tonsurans is unique because of its marked sized and morphological variability of its microconidia which may be round, tear shaped, cigar shaped, or swollen and enlarged.
The top right image shows a T. tonsurans culture plate demonstrating at the center of the colony a wrinkled appearance, though, overall, the colony exhibits a glabrous or smooth velvety appearance, as well as its characteristic yellowish-beige coloration. The bottom right image shows a T. tonsurans lactophenol cotton blue preparation demonstrating macroconidia and filamentous hyphae.