Sclerotia are not mushrooms, although they are often referred to as "magic truffles" or "philosopher's stones" and are used for their psychoactive effects in a similar way to mushrooms.

Sclerotia are actually compact masses of hardened mycelium, the vegetative part of a fungus that is responsible for nutrient uptake and growth. They are formed by some species of fungi as a survival mechanism in response to adverse environmental conditions such as drought or lack of nutrients. Sclerotia can remain dormant for long periods of time and when conditions become more favorable, they can sprout and form new fungal growth.

While not all fungi form sclerotia, some species that are known to produce sclerotia include the fungi in the genus Psilocybe, which also includes many of the mushrooms that are commonly used for their psychoactive effects.
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