FUNGUS-LIKE PROTISTS

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FUNGUS-LIKE PROTISTS
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CHARACTERISTICS

• similar to fungi
• Appearance
• mode of nutrition
• non-photosynthetic
• life cycle
• mold-like and Ameba-like

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SLIME Molds

• Dominant stage
• amoeba-like cells (phagocytic)
• near rich sources of food
• (e.g. rotting wood, piles of compost, thick wet
  lawns)
• Scarcity of nutrients
• cells aggregate ? slimy mass ?spore-bearing
  structure ? amoeba-like cells

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SLIME MOLDS

• Phylum Myxomycota

• Phylum Acrasiomycota

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Phylum Myxomycota

• acellular or plasmodial slime molds
• Plasmodium
• large cytoplasmic mass (multinucleate)
• feeding stage
• forms spores
• Unfavorable conditions fruiting
• spore-bearing
• haploid spores (meiosis)

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Phylum Myxomycota

• spores ? flagellated gametes ?diploid zygote
  (sexual reproduction) ?diploid amoeboid cells
• e.g. Physarum

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Physarum polycephalum
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Physarum polycephalum
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Comatricha typhoides
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Lycolaga epinendrumwolfs milk
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Stemonitis splendenschocolate tube slime
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Arcyris denudatacarnival candy slime
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Brefeldia maximatapioca slime
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Tubifera ferruginosared raspberry slime
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Phylum Acrasiomycota

• cellular slime molds
• pseudoplasmodium
• separated by cell membranes
• Cell aggregation
• slug-like form
• migrates to form fruiting body
• spores by mitosis

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Phylum Acrasiomycota

• reproduction is asexual
• e.g. Dictyostelium discoideum

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DEVELOPMENTAL STAGES OF A CELLULAR SLIME MOLD
DIctyostelium sp.
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