DESCRIPTIONS OF MEDICAL FUNGI

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128 Descriptions of Medical Fungi Microsporum canis Bodin Supplementary description for Microsporum canis var. distortum, a dysgonic variant of M. canis with distinctive distorted macroconidia. Abundant growth and sporulation on rice grains. Microsporum canis var. distortum is a zoophilic fungus known to cause infections in cats, dogs and other animals. It is a rare cause of tinea capitis in New Zealand, Australia and North America. Clinical disease is similar to M. canis. Invaded hairs show an ectothrix infection and fluoresce a bright greenish-yellow under Wood’s ultra-violet light. a b 10 μm Microsporum canis var. distortum (a) culture and (b) distorted macroconidia. Microsporum canis var. equinum is now considered to be a genotypic synonym of Microsporum canis (de Hoog et al. 2000). This variant of M. canis is a rare cause of ringworm of horses. Invaded hairs show an ectothrix infection and fluoresce a bright greenish-yellow under Wood’s ultra-violet light. Rarely infects man or other animal species. Reported from Australia, Europe and North America. a b 10 μm Microsporum canis var. equinum (a) colonies are pale buff to pale salmon with, a buff to pinkish-buff to yellow-brown reverse. (b) Macroconidia are small, broad, irregular, spindle-shaped, 18-60 x 5-15 µm with rough thick walls and few septa. Microconidia are pyriform to clavate in shape, 3-9 x 1.5-3.5 µm, but are rarely produced.
Descriptions of Medical Fungi 129 Microsporum ferrugineum Ota 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”. a b 20 µm Microsporum ferrugineum (a) culture and (b) “bamboo hyphae”.
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DESCRIPTIONS OF MEDICAL FUNGI

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