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Unknown 31 = Aphanoascus fulvescens
Direct microscopy (KOH Parker ink): KOH mount of infected skin scales showing typical dermatophyte-like hyphae breaking up into arthroconidia.
Culture: Colonies are moderately fast growing, white to tan with the production of numerous spherical, pseudoparenchymatous, buff to light brown cleistothecia (non-ostiolate ascocarps).
Microscopy: Aphanoascus fulvescens has a Chrysosporium-like anamorph showing typical pyriform to clavate-shaped conidia with truncated bases, which are formed either intercalary, laterally or terminally.
Asci are subspherical to ellipsoidal and eight-spored. Ascospores light brown, yellowish to pale brown in mass, irregularly reticulate to lens-shaped.
Key features: Keratinolytic ascomycete with a Chrysosporium anamorph.
Comment: Aphanoascus fulvescens is a soil keratinolytic ascomycete which occasionally causes dermatomycosis in man and animals. RG-2 organism.
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