Teleomorph: Arachnomyces nodososetosus Sigler & Abbott
Colonies grow slowly and are velvety to lanose, white to yellowish, with a brownish reverse. 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. RG-2 organism.
Culture and arthroconidia of Onychocola canadensis.
Key Features: slow growing, white, arthroconidial mould isolated from nails.
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.
Domsch, K.H., W. Gams, and T.H. Anderson. 1980. Compendium of soil fungi. Volume 1. Academic Press, London, UK.
Rippon, J.W. 1988. Medical Mycology. 3rd Edition. W.B. Saunders Co., Philadelphia, USA.