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Mould Identification: A Virtual Self Assessment

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Unknown 54 = Epidemophyton floccosum

Case History
A 27 year old male presented with a circular erythematous lesion on the inner thigh. Direct microscopy of skin scrapings revealed the presence of septate fungal hyphae breaking up into arthroconidia. The culture below was isolated.
Clinical Presentation

Tinea of the groin (tinea cruris) showing typical circular, erythematous lesions with raised advancing margins.
Direct Microscopy (KOH mount)

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.

About Epidermophyton Back to Virtual Assessment

What is your identification?

Trichophyton tonsurans
Trichophyton interdigitale
Epidermophyton floccosum

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Dr David Ellis
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