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Mould Identification: A Virtual Self Assessment

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Unknown 73 = Arthroderma ajelloi

Case History
A zoo keeper performing routine environmental screening for Aspergillus in an ostrich enclosure isolated the fungus below from decaying feathers.
Culture

Colonies are usually flat, powdery, cream to tan to orange-tan in colour, with a blackish-purple submerged fringe and reverse.
Microscopy

Macroconidia are numerous, smooth, thick-walled, elongate, cigar-shaped, 29 to 65 by 5 to 10 um, and multiseptate with up to 9 or 10 septa. Microconidia are usually absent, but when present are ovate to pyriform in shape.  RG-1 organism.
Comment: Arthroderma ajelloi is a geophilic fungus with a world-wide distribution which may occur as a saprophytic contaminant on humans and animals. Infections in man and animals doubtful. Not known to invade hair in vivo, but produces hair perforations in vitro.

About Arthroderma Back to Virtual Assessment

What is your identification?

Arthroderma terrestre
Chrysosporium tropicum
Arthroderma ajelloi

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Dr David Ellis
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