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Colonial Morphology
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Microscopic Morphology Phase Contrast
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Biochemical Reactions: BCP, SDA and Urease
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- Growth
rate: rapid
- Texture:
granular to powdery, flat, spreading
- Thallus
color: tan to cinnamon brown with cottony white centre
- Reverse:
beige to red brown
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- many
rough, thin walled macroconidia, with symmetrically rounded tip
- pyriform
microconidia, lateral
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- BCP:
profuse, no change
- Urease:
positive
- Hair
perforation: positive
- Vitamin
requirement: none
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Compare to and Differentiate from:
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Etiology & Ecology
- geophilic
- worldwide,
rare in North America, Europe, common in South America
- feet,
hand, body, scalp, rarely nails
- usually
acquired from soil but occasionally animals, also flies
- etiology
of other dermatophytes
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