Mould Identification: A Virtual Self Assessment
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Unknown 74 = Phialophora verrucosa
|A 40-year-old male timber worker from Queensland Australia presented with chronic verrucou slesions of the hand. Direct microscopy of skin scrapings mounted in 10% KOH showed the presence of fungal elements and the culture shown below was isolated.|
Chronic verrucous chromoblastomycosis of the hand. Note tissue hyperplasia forming a white verrucoid cutaneous lesion. In Australia, chromoblastomycosis occurs mostly on the hands and arms of timber and cattle workers in humid tropical forests.
Skin scrapings from a patient with chromoblastomycosis mounted in 10% KOH and Parker ink solution showing characteristic brown pigmented, planate-dividing, rounded sclerotic bodies.
Colonies of Phialophora verrucosa are slow growing, initially dome-shaped, later becoming flat, suede-like and olivaceous to black in colour.
Phialides of Phialophora verrucosa are flask-shaped or elliptical with distinctive funnel-shaped, darkly pigmented collarettes. Conidia are ellipsoidal, smooth-walled, hyaline, mostly 3.0-5.0 x 1.5-3.0 μm, and aggregate in slimy heads at the apices of the phialide. RG-2 organism.
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