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Mould Identification: A Virtual Self Assessment

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Unknown 74 = Phialophora verrucosa

Case History
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.
Clinical Presentation

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.
Direct Microscopy

Skin scrapings from a patient with chromoblastomycosis mounted in 10% KOH and Parker ink solution showing characteristic brown pigmented, planate-dividing, rounded sclerotic bodies.
Culture

Colonies of Phialophora verrucosa are slow growing, initially dome-shaped, later becoming flat, suede-like and olivaceous to black in colour.
Microscopy

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.
Comment: Phialophora verrucosa is a well documented causative agent of chromoblastomycosis, and mycetoma.   It produces characteristic flask-shaped phialides with distinctive funnel-shaped, darkly pigmented collarettes. Environmental isolations have been made from plant debris, wood piles, fence posts, tree stumps, soil and animal faece.

About Phialophora Back to Virtual Assessment

What is your identification?

Acrophialophora fusispora
Phialophora verrucosa
Pleurostomophora richardsiae

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Dr David Ellis
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