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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchSlime moulds are not fungi. They can look fungus-like because both can produce spore-bearing structures, but slime moulds feed in amoeba-like stages—sometimes as a moving mass that engulfs food—while fungi typically absorb nutrients through threadlike hyphae. If one has appeared in your garden, it is generally not a plant disease: slime moulds do not attack plants, though a patch may temporarily cover a surface or look unsightly.
How slime moulds differ from fungi
| Feature | Slime moulds | Fungi |
|---|---|---|
| Classification | Outside Kingdom Fungi. The dog-vomit slime mould, Fuligo septica, is classified in Amoebozoa; “slime mould” is a common grouping, not a single precise taxonomic unit. | Members of Kingdom Fungi. |
| Feeding | Amoeba-like cells or a plasmodium engulf bacteria, fungal spores and small organic particles. | Hyphae access food through the fungal network. |
| Vegetative structure | Some forms remain separate cells; plasmodial forms can be one membrane-bound mass containing many nuclei. | Commonly threadlike hyphae organized into a broader network called a mycelium. |
| Spore-bearing structures | Can form structures that release spores. | Can also form spore-producing structures, including mushrooms and moulds. |
| Garden role | Do not attack plants; may appear on mulch, decaying material or plant stems. | Many fungi decompose dead matter; some interact with living plants, including through beneficial root associations. |
These are broad contrasts, not a way to identify every organism from one feature. Spores alone do not make something a fungus, and the phrase “slime mould” covers forms with different cellular organization. The National Park Service notes that slime moulds “are not molds despite the name,” while exhibiting traits associated with fungi and animals (National Park Service, “Slime Molds,” updated September 28, 2020).
Why the two can look alike
Both groups can produce visible structures that release spores. In fungi, a mushroom is a reproductive structure rather than the whole organism: the fungal network may continue below or within the material it is growing on. Slime moulds also form spore-bearing structures, sometimes suddenly and in striking colors. A shared reproductive strategy does not mean the organisms belong to the same group.
Slime moulds also differ from the familiar fungal “threads.” Fungal hyphae collectively form mycelium. A plasmodial slime mould may look like a broad mass or network, but it is not a fungal mycelium: it is a feeding body that moves and engulfs food. The University of California Agriculture and Natural Resources explains the hyphae-and-mycelium distinction in its garden guide, “Fungi in Your Garden”.
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Slime moulds have more than one body plan
Plasmodial slime moulds
A plasmodial slime mould can begin as amoeboid cells that join into a single, multinucleate mass enclosed by one cell membrane. It can move as its protoplasm streams through the body. When conditions change—including when food becomes scarce, as described by the Royal Horticultural Society (RHS)—the plasmodium can form spore-bearing structures. Spores can germinate into single-celled forms; in very wet conditions, some of those forms can grow flagella and swim.
Cellular slime moulds
Cellular slime moulds follow a different pattern. Individual cells remain separate through much of their life cycle. In response to a food source, they can aggregate, but each cell retains its own integrity rather than merging into one multinucleate plasmodium. Their fruiting bodies release spores, which germinate into amoeboid cells. The National Park Service describes both patterns in its overview of slime moulds.
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What a slime mould in the garden means
Slime moulds feed on microbes and small organic material, not on the plant they happen to be sitting on. They may appear on mulch, leaf litter, decaying wood or stems. A stem can serve as a support for a slime mould’s spore-producing structures; its presence there is not evidence that it is consuming the plant. Slime moulds contribute to food-web processes and nutrient recycling in decomposing material, while fungi also play important decomposition and soil roles.
One familiar example is the dog-vomit or scrambled-egg slime mould, Fuligo septica. The Missouri Department of Conservation describes its plasmodium as a yellow, tan or whitish foamy mass that can dry into a darker, crusty spore-producing stage. It is found on mulch, decaying wood and other rotting plant material in warm, humid weather. The department lists it as not edible; do not treat an identification based on appearance as a reason to handle or eat a specimen.
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Slime moulds are generally harmless to most plants and pets and, for the most part, people, according to University of Maine Cooperative Extension. Spores may irritate people with respiratory conditions, so avoid disturbing a dry, spore-producing patch if that is a concern.
Should you remove one?
Usually, no treatment is needed. University of Maine Cooperative Extension says no pesticide is recommended, and the RHS says control is unnecessary. If a patch is unattractive, water can disperse it cosmetically; that is not eradication. The Missouri Department of Conservation warns that water can raise or spread spores from the spore-producing stage, so avoid spraying a dry, crusty mass if you do not want to scatter spores.
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Removing a visible structure also does not necessarily remove the organism from the surrounding habitat. That is true of fungi too: UCANR notes that removing a mushroom does not kill the fungal growth beneath or within its substrate. In either case, appearance above the surface is not a complete picture of the organism.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Quick identification cues—and their limits
- Foamy or spreading mass on mulch or rotting wood: could be a plasmodial slime mould, including Fuligo septica; color and texture can change as it dries.
- Threadlike growth forming a network: consistent with fungal hyphae and mycelium, but a single visual impression is not a definitive identification.
- A spore-bearing structure: not enough to distinguish the groups, because both slime moulds and fungi release spores.
- Growth on a living stem: does not by itself show plant infection; slime moulds may use stems as support rather than as food.
Color, location and shape are useful clues, not universal diagnostic rules. Slime moulds vary, and the cellular and plasmodial forms do not share one identical life cycle.
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