The Student's Guide to Myxomycetes (Class 11 & Beyond)

Whether you are studying for your Class 11 Biology exams or working on a science fair project, slime moulds are one of the most interesting topics in the curriculum.

Here is a summarized “Cheat Sheet” of everything you need to know about the Phylum Myxomycota.

1. Classification & Kingdom

• Kingdom: Protista (The group of eukaryotes that aren’t plants, animals, or fungi).
• Group: Saprophytic Protists.
• Nature: They are “Acellular” (in the case of Physarum) meaning they are one giant mass of cytoplasm with many nuclei.

2. Key Characteristics

• Habitat: Found on decaying twigs, leaves, and moist organic matter.
• Body: The vegetative body is called a Plasmodium.
• Cell Wall: During the vegetative (moving) phase, they have no cell wall. They only develop true cell walls (made of cellulose) when they become spores.
• Nutrition: They move along decaying material, engulfing bacteria and organic particles.

3. The Life Cycle (Step-by-Step)

1. Plasmodium Stage: Under favorable conditions, they form an aggregation called a plasmodium which may spread over several feet.
2. Fruiting Stage: When conditions become unfavorable (dry or no food), the plasmodium differentiates into Fruiting Bodies.
3. Spore Stage: These fruiting bodies bear spores at their tips.
4. Survival: Spores possess true walls and are extremely resistant. They can survive for many years and are dispersed by air currents.
5. Germination: When moisture returns, the spores germinate into tiny amoebae or swarm cells, which fuse to start a new plasmodium.

4. Why are they unique?

Slime moulds are often called “Fungus-Animals” because:

• Animal-like: They move (via protoplasmic streaming) and ingest food.
• Fungus-like: They produce spores for reproduction.

5. Summary Table for Exams

Feature	Characteristic
Kingdom	Protista
Stage of life	Saprophytic
Body Type	Plasmodium (Syncytium)
Reproduction	Spores with true cellulose walls
Dispersal	By Air Currents

Study Tip: Remember that the plasmodium is Diploid (2n), while the spores are Haploid (n). This alteration of generations is a key part of their survival strategy.

Want to see a real experiment? Check out the Lego Maze Challenge.