Mould Identification: A Virtual Self Assessment
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Unknown 22 = Hortaea werneckii
|A 25-year-old Caucasian male from Darwin, presented with non-inflammatory, brown pigmented, non-scaling lesions on the palmar aspects of his hands. Direct microscopy showed the presence of fungal elements and the fungus shown below was isolated.|
Brown to black, non-scaling macules on the palmar aspect of the hands are typical of Tinea nigra. Note there is no inflammatory reaction.
Skin scrapings mounted in 10% KOH showing pigmented brown to dark olivaceous (dematiaceous) septate hyphal elements and 2-celled yeast cells producing annelloconidia typical of Hortaea werneckii.
Cultures of Hortaea werneckii are slow growing, initially mucoid, yeast-like and shiny black. With age they develop abundant aerial mycelia and become dark olivaceous in color.
Microscopically, colonies consist of brown to dark olivaceous septate hyphal elements and numerous 2-celled, pale brown, cylindrical to spindle-shaped yeast-like cells that taper towards the ends to form an annellide. Most yeast-like cells also have prominent darkly pigmented septa. Annellides may also arise from the hyphae. Conidia are l to 2-celled, cylindrical to spindle-shaped, hyaline to pale brown and usually occur in aggregated masses.
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