You are here: 
text zoom : S | M | L
Printer Friendly Version
Further Enquiries

School of Biological Sciences
The University of Adelaide

Dr David Ellis

Exophiala dermatitidis

Wangiella dermatitidis
Phaeococcomyces exophialae

Exophiala dermatitidis has been isolated from plant debris and soil and is a recognised causative agent of mycetoma and phaeohyphomycosis in humans (Zeng et al. 2007).

RG-2 organism.

Morphological Description: Colonies are slow growing, initially yeast-like and black, becoming suede-like, olivaceous-grey with the development of aerial mycelium with age. A brown pigment is often produced in the agar. The initial yeast-like phase is characterised by unicellular, ovoid to elliptical, budding yeast-like cells. The yeast-like cells are hyaline and thin-walled when young becoming darkly pigmented (dematiaceous) and thick-walled when mature. With the development of mycelium, flask-shaped to cylindrical annellides are produced. Conidia are hyaline to pale brown, one-celled, round to obovoid, 2-4 x 2.5-6 µm, smooth-walled and accumulate in slimy balls at the apices of the annellides or down their sides. Cultures grow at 42OC and on media containing 0.1% cycloheximide.

Molecular Identification: ITS and/or D1/D2 sequencing is recommended for species identification (Halliday et al. 2015).

References: de Hoog and Hermanides-Nijhof (1977), McGinnis (1980), Hohl et al. (1983), Nishimura and Miyaji (1983), Matsumoto et al. (1984), Dixon and Polak-Wyss (1991), de Hoog et al. (2000, 2015).

Phialides and conidia
Phialides and conidia of Exophiala dermatitidis.


Mycosis: Phaeohyphomycosis