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Understanding Fungus-Like Protists: Characteristics and Life Cycle

Explore the world of slime molds, non-photosynthetic protists similar to fungi. Learn about their appearance, nutrition, and life cycle stages, including Phylum Myxomycota and Phylum Acrasiomycota.

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Understanding Fungus-Like Protists: Characteristics and Life Cycle

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  1. FUNGUS-LIKE PROTISTS

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

  3. 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

  4. Phylum Myxomycota Phylum Acrasiomycota SLIME MOLDS

  5. Phylum Myxomycota • acellular or plasmodial slime molds • Plasmodium • large cytoplasmic mass (multinucleate) • feeding stage • forms spores • Unfavorable conditions: “fruiting” • spore-bearing • haploid spores (meiosis)

  6. Phylum Myxomycota • spores → flagellated gametes →diploid zygote (sexual reproduction) →*diploid amoeboid cells • e.g. Physarum

  7. Physarum polycephalum

  8. Physarum polycephalum

  9. Comatricha typhoides

  10. Lycolaga epinendrum“wolf’s milk”

  11. Stemonitis splendens“chocolate tube slime”

  12. Arcyris denudata“carnival candy slime”

  13. Brefeldia maxima“tapioca slime”

  14. Tubifera ferruginosa“red raspberry slime”

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

  16. Phylum Acrasiomycota • reproduction is asexual • e.g. Dictyostelium discoideum

  17. DEVELOPMENTAL STAGES OF A CELLULAR SLIME MOLD DIctyostelium sp.

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