Trichophyton rubrum

Colonial Morphology	Microscopic Morphology Phase Contrast	Biochemical Reactions: BCP, SDA and Urease
Growth rate: slow to moderately rapid Texture: downy to cottony Thallus color: white to pale pink Reverse: blood red (PDA) to reddish brown (SDA, Mycosel) Variants: yellow, may produce red pigment on PDA coffee brown soluble pigment unpigmented deeply red, heaped up, folded yellow orange reverse	few pyriform, lateral microconidia pencil shaped macroconidia uncommon microconidia form on macroconidia arthroconidia produced from hyphae and macroconidia	BCP: restricted, no change Urease: negative Vitamin requirement: none Hair perforation: negative
Compare to and Differentiate from: T. violaceum: vitamin requirements T. mentagrophytes: BCP, urease, hair perforation T. raubitschekii: urease T. tonsurans: vitamin requirements T. megninii: vitamin requirements, BCP, urea	Etiology & Ecology anthrophilic, seldom isolated from animals, never found in soil worldwide feet, nails, body, groin, rarely scalp both endothrix and ectothrix most frequently isolated dermatophyte etiology of other dermatophytes

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