Fungus

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Fungus
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P.B.J.
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Tomato
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Popcorn
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Wheat Bread
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Cake
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Oral Thrush
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Skin Fungus
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Ringworm
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Advanced Athletes Foot
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Ringworm - Foot of 77 year old Woman
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Paracoccidioidomycosis
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What is Fungus?

• Have cell walls (Chitin)
• Eukaryotic
• Unicellular (yeast)
• Most Multicellular
• Heterotrophic
• (Extracellular Digestion)
• Absorptive heterotroph
• Decomposers, Parasites or Mutualists

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Fungal Structure

• Hyphae
• Threadlike filaments that develop from spores
• Anchor
• Reproductive
• Invade Energy Source
• Mycelium
• Network of Hyphae

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Feeding

• Extracellular Digestion
• Food is digested outside of cell
• Digested products then Absorbed
• 3 Types of Feeding
• Saprophytes
• Mutualists
• Parasites

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Saprophytes

• Decomposers
• Dead organic material

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Mutualists

• Form symbiotic relationship with another organism

• Example Mycorrhiza
• Tree Roots
• Give Water Absorption, Make minerals available
• Get Food from Tree
• 90 of all trees depend on Mycorrhiza

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Parasitic

• Absorb nutrients from the cells of host
• Can produce special hyphae known as Haustoria
• Penetrate host cell and absorb nutrients directly

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Butt Rot
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Reproduction

• Fragmentation
• Hyphae that get broken off to form new Mycelia
• Budding
• Asexual reproduction
• Mitosis occurs and a new individual pinches off
  from parent
• Spores (Most produce spores)
• Reproductive cell that can develop into new
  organism

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Spores Cont.

• Hyphae emerge from spore
• Sporangium
• Specialized hyphae that grow away from mycelium
• Structure containing spores
• Over 1 trillion spores can be released from a
  single sporangium
• Spores can be dispersed by way of wind, animals
  water

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