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School of Biological Sciences
The University of Adelaide

Dr David Ellis

Microsporum ferrugineum

Microsporum ferrugineum is an anthropophilic fungus causing epidemic juvenile tinea capitis in humans. The clinical features are similar to those of infections caused by M. audouinii. Invaded hairs show an ectothrix infection and fluoresce a greenish-yellow under Wood’s ultra-violet light. Reported from Asia (including China and Japan), Russia, Eastern Europe and Africa.

RG-2 organism.

Morphological Description: Colonies are slow growing, forming a waxy, glabrous, convoluted thallus with a cream to buff-coloured surface and no reverse pigment. Note: Surface pigmentation may vary from cream to yellow to deep red and a flatter white form sometimes occurs. Cultures rapidly become downy and pleomorphic. Microscopic morphology is negative, microconidia or macroconidia are not produced. However, irregular branching hyphae with prominent cross walls (“bamboo hyphae”) and chlamydospores are seen. “Bamboo hyphae” are a characteristic of this species.

Key Features: Clinical history, culture characteristics and distinctive “bamboo hyphae”.

Culture of Microsporum ferrugineum
Culture of Microsporum ferrugineum.

"Bamboo hyphae" of M. ferrugineum.


Mycosis: Dermatophytosis