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Mould Identification: A Virtual Self Assessment

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Unknown 17 = Purpureocillium lilacinus

Case History
A 57 year-old male bricklayer who developed lesion on his right arm. A punch biopsy was taken and cultures grew the fungus shown below.
Culture

Colonies are fast growing, suede-like and vinaceous to violet in colour, but never green or blue-green as in Penicillium.
Microscopy

Conidiophores are erect, 400-600 um in length bearing branches with densely clustered phialides. Conidiophore strips are 3-4 um wide, yellow to purple and are rough walled. Phialides are swollen at their bases, gradually tapering into a slender neck. Conidia in chains are ellipsoidal to fusiform, smooth walled to slightly roughened hyaline, purple in mass 2.5-3.0X2.0-2.2 um.
Comment: Purpureocillium lilacinum is commonly isolated from soil, decaying vegetation, insects, nematodes and as a laboratory contaminant. It is also a causative agent of infection in human and other vertebrates

About Purpureocillium Back to Virtual Assessment

What is your identification?

Penicillium chrysogenum
Purpureocillium lilacinus
Tritrachium oryzae

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Dr David Ellis
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