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Mould Identification: A Virtual Self Assessment

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Unknown 75 = Epicoccum nigrum

Case History
A 35-year old male sheep grazier presented with a suspected fungal infection of the great toe nail.  Nail scrapings were taken.  KOH microscopy was negative, however the culture seen below was isolated.
Culture

Colonies are fast growing, suede-like to downy, with a strong yellow to orange-brown diffusable pigmentation. When sporulating numerous black sporodochia (aggregates of conidiophores) are visible.
Microscopy

Conidia are formed singly on densely compacted, nonspecialized, determinant, slightly pigmented conidiophores. Conidia are globose pyriform, mostly l5-25 um diameter with a funnel-shaped base and broad attachment scar, often seceding with a protuberant basal cell; i.e. aleuric or rhexolytic dehescence of conidia. Conidia become multicellular (dictyoconidia), darkly pigmented and have verrucose external surface.  RG-1 organism.
Comment:
Epicoccum nigrum is a cosmopolitan saprophyte of world-wide distribution which is occasionally isolated as a contaminant from clinical specimens, like skin.

EpicoccumBack to Virtual Assessment

What is your identification?

Ulocladium chartarum
Epicoccum nigrum
Pithomyces chartarum

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Dr David Ellis
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