Most slimy mushrooms sold in stores or found in your refrigerator are not safe to eat if the sliminess is due to spoilage; the slime usually signals a dense layer of bacteria (biofilm) growing on the mushroom surface. Although the slime itself is generally produced by spoilage bacteria that are not typically harmful to humans, the mushrooms are breaking down and may taste unpleasant or smell bad, indicating it’s time to throw them out[1][3].
If mushrooms are only slightly slimy but still smell normal, experts suggest you could use them if cooked thoroughly—such as in a hot soup—because high temperatures can kill most bacteria present[1]. However, most food safety authorities and mushroom suppliers recommend prioritizing mushrooms that are dry, firm, and fresh-smelling, and discarding any that are noticeably slimy, smelly, or moldy[5].
There are also certain edible wild mushrooms with naturally slimy caps, such as Suillus luteus (Slippery Jack) and Gomphidius species (Spike Caps). These wild types can be eaten, although their slimy coating is not always appealing and is often removed before cooking, as it may cause indigestion for some people[2][4][6][8].
To summarize:
- If store-bought mushrooms have become slimy from age or improper storage, it’s safest to discard them.
- If a wild mushroom’s slimy cap is a normal species trait and the species is known to be edible, it can be consumed, usually after peeling or cleaning off the slime and cooking it well.
- Always avoid eating any mushrooms (wild or cultivated) with an unpleasant smell, obvious mold, or signs of decay.
References
- [1] Can you eat slimy mushrooms?
- [2] Spike Cap Mushrooms: Identification, Edibility, and Lookalikes
- [3] My mushrooms are getting kind of slimy, can I still eat them?
- [4] Suillus luteus – Wikipedia
- [5] Slimy mushrooms – Houzz Forum
- [6] Slippery Jacks, Jills and cows: the yummy, delicate mushrooms in pine forests
- [8] Slippery Jacks: A Beginner’s Guide to Identification and Foraging
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