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fungi

fungi

classification of fungi

moulds

  • multicellular filaments or hyphae; aerobic;
  • reproduce by:
    • spores:
      • sexual, small no's (eg.ascospores)
      • asexual, large no's (eg.conidia)
    • hyphal fragments;

dermatophytes

  • hyphae/arthrospores; keratinolytic enzymes;
  • arthrospore arrangement on hair:
    • small spore ectothrix (around base of hair)
    • large spore ectothrix
    • endothrix (chains of spores inside hair shaft)
  • Microsporum
    • canis (green fluorescence; small ecto.; cats/dogs)
      • ⇒ tin. capitis/corporis most common cause)
    • audouini (green fluorescence; small ecto.; rare; humans
      • ⇒ tin.capitis rarely;
  • Trichophyton
    • rubrum
      • ⇒ all forms tinea except capitis;
    • tonsurans (endo.; human)
      • ⇒ tin. capitis;
    • verrucosum (large spored ecto.; cattle)
      • ⇒ tin. barbae/corporis;
  • Epidermophyton
    • floccosum
      • ⇒ tin. corporis/pedis/cruris;
  • Pityrosporum (Malassezia) (yeast-like)

other filamentous fungi

yeasts

  • round/oval, unicellular, but sometimes form filaments as well;
  • reproduce vegetatively by budding → blastospores;
  • facultative anaerobes; form bacteria-like colonies on agar;
  • may be Gram stained;
  • candida fungal infection / thrush (budding; pseudohyphae)
  • Torulopsis
  • Cryptococcus (budding; v.large slimy polysacc.capsules; no hyphae)
fungi.txt · Last modified: 2020/07/20 17:56 by gary1