Every mushroom carries a microscopic entourage—spores, dust, and debris from the environment it calls home. Now, scientists are learning to read these invisible signatures like barcodes, linking a mushroom (or anything it’s touched) back to its exact origin. From busting truffle fraud to proving crop theft in court, forensic mycology is moving from niche lab work to a trusted investigative tool. And in the Grand Cosmic Mycelial Network, spores don’t just grow—they remember.