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Mould Identification: A Virtual Self Assessment

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Unknown 53 = Chrysosporium tropicum

Case History
A veterinarian submitted the culture shown below which was isolated from a skin lesion from a pet Australian Eastern Water Dragon Lizard (Physignathus lesueurii).
Culture

Colonies are moderately fast growing, flat, white to tan to beige in colour, often with a powdery or granular surface texture. Reverse pigment absent or pale brownish-yellow with age. RG-2 organism.
Microscopy

Hyaline, one-celled (ameroconidia) are produced directly on vegetative hyphae by non-specialized conidiogenous cells. Conidia are typically pyriform to clavate with truncate bases (6 to 7 by 3.5 to 4 um) and are formed either intercalary (arthroconidia), laterally (often on pedicels) or terminally. No macroconidia or hyphal spirals are seen.
Comment: Species of Chrysosporium are occasionally isolated from skin and nail scrapings, especially from feet, but because they are common soil saprophytes they are usually considered as contaminants. There are about 70 species of Chrysosporium, several are keratinophilic with some also being thermotolerant, and cultures may closely resemble some dermatophytes, especially Trichophyton mentagrophytes, and some strains may also resemble cultures of Histoplasma and Blastomyces.

About Chrysosporium Back to Virtual Assessment

What is your identification?

Trichophyton erinacei
Aphanoascus fulvescens
Chrysosporium tropicum

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