The fruiting body is the visible mushroom structure; mycelium is the network growing through its substrate. A useful label describes the fungal material and any substrate left in the product.
Biology is not a grade
Neither term alone establishes finished-product quality. Fresh culinary mushrooms are chosen for freshness and texture. A processed ingredient needs information about species, processing, and composition. Fruiting body is useful disclosure, not a substitute for every other quality check.
Ask about substrate
Mycelium can be cultivated on solid substrate or in liquid culture. If substrate remains in the packaged ingredient, that changes what the customer receives. Ask whether the product contains separated biomass or a combination. Do not assume all mycelium products contain the same carrier or amount.
Compare equivalent products
Line up the species, ingredient form, serving mass, extract status, and available testing before comparing prices. A raw powder and concentrated extract are not equivalent merely because they come in capsules. Transparency should make the distinction visible without requiring the customer to interpret a marketing slogan.
Further reading
Cornell: Adding specialty mushroomsThis reference provides background, not an endorsement of Liona or verification of an unreleased product.