This Is Awkward: Mushrooms That Cause ‘Tiny Human’ Hallucinations Don’t Contain Psychedelics

University of Utah researchers have discovered that the mushroom Lanmaoa asiatica causes vivid hallucinations of miniature people without containing any known psychedelic compounds. Published in Mycologia in 2026, the study used genome sequencing to rule out psilocybin and ibotenic acid, suggesting a previously unknown metabolite is responsible for the effect.

For decades, reports from Yunnan, China, described a specific kind of “mushroom madness” that defied standard psychedelic profiles. While traditional magic mushrooms trigger geometric patterns and pulsing colors, L. asiatica—a bolete mushroom native to pine forests in southwestern China and the northern Philippines—produces a starkly different experience. According to Live Science, users often remain functionally sober, seeing their surroundings as clear and unaltered, except for the sudden appearance of hundreds or thousands of highly detailed, three-dimensional miniature people.

The Mechanics of Lilliputian Hallucinations

These visions are formally known as Lilliputian hallucinations, named after the tiny inhabitants of Lilliput in Jonathan Swift’s 1726 novel Gulliver’s Travels. Unlike the rapid onset of psilocybin, which typically takes 30 minutes to affect the brain, the effects of L. asiatica are delayed. As the New York Post reported, these gnome-like figures typically appear 12 to 24 hours after ingestion and can persist for several days. The nature of these hallucinations is remarkably consistent across different cultures and nationalities. Users describe the figures as elves, gnomes, or clowns dressed in bright colors. These entities aren’t vague; they interact with the physical environment by crawling under doorways, diving off spoons into soup bowls, or wriggling under doors. “The little people are said to typically like teasing, playing with or harassing the person seeing them.” Colin Domnauer, University of Utah researcher Beyond the visual anomalies, other reported side effects include dizziness, auditory hallucinations, and physical sickness, according to ScienceAlert.

Genomic Evidence and the Missing Compound

To identify the chemical trigger, researchers led by Colin Domnauer sequenced the genomes of 53 mushroom samples from the Lanmaoa genus. The goal was to find the biosynthetic pathways responsible for the hallucinations. The results were unexpected: the mushroom lacks the genes required to produce the most common fungal psychoactives.

• Psilocybin/Psilocin: Absent. These compounds typically cause dilated pupils, elevated heart rate, and geometric visual distortions.
• Ibotenic Acid: Absent. This is the primary psychoactive ingredient in the fly agaric mushroom.

The absence of these markers suggests that L. asiatica operates via a completely different biochemical pathway. According to Vice, this finding supports the theory that an entirely unknown metabolite is at work, potentially opening a new category of psychoactive chemistry. “Biosynthetic gene mining of the L. asiatica genome found no close hits with any genes known in the production of mushroom psychoactive compounds,” Colin Domnauer, via ScienceAlert This genomic void explains why previous chemical analyses failed to isolate a known compound. It also explains why the physiological symptoms of L. asiatica intoxication differ so drastically from those of traditional psychedelics.

Taxonomic Shifts in the Lanmaoa Genus

The research extended beyond the search for a “magic” compound to a broader effort to map the Lanmaoa family. Because these mushrooms share many physical characteristics, they have historically been difficult to categorize. L. asiatica itself was only described to science in 2015, despite being sold in Yunnan markets for decades. By identifying 1,515 corresponding genes across specimens, researchers have expanded the genus to 17 recognized species. This process included the identification of four previously unknown species, including Lanmaoa fallax and Lanmaoa carbonilivor. This taxonomic clarity is more than an academic exercise. Because Lanmaoa species are globally traded commercial products, the risk of misidentifying wild edible mushrooms with poisonous lookalikes is a serious public safety concern. “That highlights the need for greater taxonomic understanding.” Colin Domnauer, via ScienceAlert

Implications for Drug Discovery and Neurology

The discovery of a reliable, non-psilocybin-based hallucinogen has significant implications for neuroscience. Currently, science does not fully understand how the brain produces such specific, rendered figures or how to treat the resulting intoxication. Because L. asiatica is the only known substance to reliably produce this specific effect, it provides a unique tool for studying the brain’s visual processing systems. The research also points toward future pharmaceutical applications. The genomic data may support drug discovery efforts by revealing how bioactive secondary chemistry evolves within the Lanmaoa genus. For now, the mushroom remains a wild curiosity. Due to its mycorrhizal relationship with pine trees, L. asiatica cannot be cultivated artificially, meaning it only exists in its wild habitats. While the “gnome” trips are disconcerting to some, they are a known risk for those in Yunnan who consume the mushroom raw or undercooked—a risk many locals are reportedly willing to take.