What does a bad mushroom look like?

Best answer
A slimy film is the telltale sign of a spoiled mushroom. If you catch it early and cook 'em up right away you can get another day out of your 'shrooms, but once the slime starts, it's a slippery slope toward the darkening in color and mushy texture that indicate mold of the inedible variety.
FAQ ❔
While they may be delicious sliced raw on a salad, mushrooms are more nutritious when cooked. Cooking mushrooms also destroys any toxins and carcinogens. Many nutrients in mushrooms are more accessible after they have been cooked, including some powerful antioxidants- carotenoids and ferulic acid..
The best (read: healthiest) way to cook mushrooms, according to the research, isn't in a pan. Rather, you will reap the most health benefits from your white button, portabella, cremini, or shiitake mushrooms by grilling them—and microwaving them.
Oyster and shiitake mushrooms have the most fiber (at 2g per serving), Lemond says, and raw maitake mushrooms and portobellos exposed to UV light are among the highest in vitamin D. White mushrooms are also sold with enhanced levels of vitamin D. Ultimately, though, any mushroom is a good choice.
Mushrooms can protect your brain as you age. They recommend eating at least five button mushrooms per day to reduce your risk of neurological illness in the future. Cook the 'shrooms to best preserve their nutritional benefits, either by microwaving or grilling.
Raw mushrooms are largely indigestible because of their tough cell walls, mainly composed of chitin. Dr. Andrew Weil advises, in agreement with other experts, that mushrooms must be cooked! “Mushrooms have very tough cell walls and are essentially indigestible if you don't cook them.
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