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While many psychedelics have captured the public imagination, one fungus from China’s Yunnan Province has puzzled scientists with its unique visual effects. Over 200 mushroom species are known to induce psychedelic experiences, yet Lanmaoa asiatica (formerly known locally as “Jian shou qing” or “see hand blue”) stands apart because it triggers vivid hallucinations of miniature people—an effect rarely linked to fungi.
For decades, residents of Yunnan’s humid summer months have reported the same unsettling symptom: seeing countless tiny human figures scurrying across every surface. Despite frequent hospital visits, the culprit remained unidentified until 2015, when researchers formally classified the species as Lanmaoa asiatica.
Locals have long consumed the mushroom, but it must be cooked thoroughly; inadequate preparation can lead to the characteristic “xiao ren ren” (little people) hallucinations. The phenomenon is consistent enough that it falls into a well‑studied category of hallucinations known as Lilliputian hallucinations—named after Jonathan Swift’s fictional island of Lilliput, where inhabitants are only a few inches tall.
Lilliputian hallucinations often involve thousands, even millions, of tiny figures interacting with real‑world objects, blurring the line between reality and perception. While such visions are typically associated with neurological disorders, schizophrenia, or plants like belladonna, they are rarely observed in mushroom intoxication.
Unlike classic “magic mushrooms” that contain psilocybin, Lanmaoa asiatica shows no trace of this well‑known psychedelic compound. Ph.D. candidate Colin Domnauer of the University of Utah has collected specimens across China, the Philippines, and Papua New Guinea. Chemical analyses of L. asiatica have uncovered no known psychoactive substances, leading Domnauer to hypothesize the existence of a novel, as‑yet‑unidentified compound responsible for the hallucinations.
In his ongoing research, Domnauer has identified four new varieties within the Lanmaoa genus and is compiling a comprehensive database of all species. This work may ultimately reveal the biochemical basis for the mushroom’s unique effects and expand our understanding of fungal psychoactivity.
