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Mould Identification: A Virtual Self Assessment

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Unknown 31 = Aphanoascus fulvescens

Case History
A 4-year-old Australian Sea-lion from Kangaroo Island presented with scaly, cutaneous lesions on the back flipper. Skin scrapings showed the presence of fungal hyphae and the culture grew the fungus shown below.
Direct Microscopy (KOH Parker ink)

KOH mount of infected skin scales showing typical dermatophyte-like hyphae breaking up into arthroconidia.
Culture
Culture view

Colonies are moderately fast growing, white to tan with the production of numerous spherical, pseudoparenchymatous, buff to light brown cleistothecia (non-ostiolate ascocarps).
Microscopy

Aphanoascus fulvescens has a Chrysosporium anamorph showing typical pyriform to clavate-shaped conidia with truncated bases, which are formed either intercalary, laterally or terminally.

Asci are subspherical to ellipsoidal and eight-spored. Ascospores light brown, yellowish to pale brown in mass, irregularly reticulate to lens-shaped.
Key Features:  Keratinolytic ascomycete with a Chrysosporium anamorph.

Comment: Aphanoascus fulvescens is a soil keratinolytic ascomycete which occasionally causes dermatomycosis in man and animals. RG-2 organism.

About Aphanoascus Back to Virtual Assessment

What is your identification?

Arthroderma simii
Chaetomium globosum
Aphanoascus fulvescens

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School of Biological Sciences
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Dr David Ellis
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