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Mould Identification: A Virtual Self Assessment

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Unknown 32 = Onychocola canadensis

Case History
A 34-year-old Austrian male ski instructor presented with suspected distal subungual onychomycosis on the big toe nail. Nail scrapings showed the presence of fungal hyphae and the culture grew the fungus shown below.
Culture

Colonies of O. canadensis are grow slowly and are velvety to lanose, white to yellowish, with a brownish reverse.
Microscopy

Arthroconidia are cylindrical to broadly ellipsoidal, one- or two-celled, hyaline to subhyaline, 4-16 x 2-5 µm in size, forming long chains. Older cultures may show broad, brown, rough-walled hyphae.

Key Features: slow growing, white, arthroconidial mould isolated from nails.

Comment: Onychocola canadensis is an uncommon cause of distal and lateral subungual or white superficial onychomycosis. However, it may sometimes be present in an abnormal-appearing nail as an insignificant finding, not acting as a pathogen.

About Onychocola Back to Virtual Assessment

What is your identification?

Scytalidium hyalinum
Onychocola canadensis
Chrysosporium tropicum

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Dr David Ellis
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