Mycology - Superficial Mycoses

Front 1

Pityriasis (Tinea) Versicolor

Back 1

• Chronic superficial skin infection
• Often young adults in tropical areas
• Lesions are hypo- or hyperpigmented, scaly and itchy and fluoresce a pale greenish color under Wood's ultra-violet light
• Causative agent is Malassezia furfur

Front 2

Malassezia furfur

microscopic and colony appearance

Back 2

Microscopic: Resemble “spaghetti and meatballs”

Colony:

• Lipophilic so must add olive oil to agar surface
• Smooth, cream-colored yeast-like colonies

Front 3

Phaeohyphomycosis or Tinea Nigra

Back 3

• Chronic skin infection that is seen young adults in tropical areas
• Single, black spot with a distinct border
• Usually on hands, bottom of feet, neck or chest
• Causative agent is Hortaea werneckii

Front 4

White Piedra

Back 4

• Infection of hair shaft
• White to tan nodules adhering loosely to the hair shaft
• Mycelia grow inward and penetrate hair cuticle
• Caused by Trichoporon beigelii (T. cutaneum)

Front 5

Black Piedra

Back 5

• Infection of hair shaft
• Seen in tropical countries
• Hard, black nodules tightly adhere to hair shaft
• Causative agent is Piedraia hortae

Front 6

Piedraia hortae

Back 6

• Dematiaceous fungus
• Slow growing, dark greenish brown to black, velvety colony
• Dark, thick walled, septate hyphae with intercalary chlamydoconidia