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Unknown 54 = Epidermophyton floccosum
Clinical presentation: Tinea of the groin (tinea cruris) showing typical circular, erythematous lesions with raised advancing margins.
Direct microscopy: KOH mount of infected skin scales showing typical dermatophyte hyphae breaking up into arthroconidia.
Culture: Cultures of E. floccosum are usually greenish-brown or khaki coloured with a suede-like surface, raised and folded in the centre, with a flat periphery and submerged fringe of growth. Older cultures may develop white pleomorphic tufts of mycelium. A deep yellowish-brown reverse pigment is usually present.
Microscopy: Microscopic morphology of E. floccosum showing characteristic smooth, thin-walled macroconidia, which are often produced in, clusters growing directly from the hyphae.
Numerous chlamydoconidia are formed in older cultures. No microconidia are formed.
Comment: An anthropophilic fungus often causing tinea pedis, tinea cruris, tinea corporis and onychomycosis. Not known to invade hair in vivo. May become epidemic among personnel using common shower or gym facilities, e.g. athletic teams, troops, ship crews and inmates of institutions. Distribution: World-wide.
Key features: Culture characteristics and microscopic morphology.
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