Scientists have identified a mushroom linked to bizarre hallucinations of miniature people who walk, climb and interact with the real world. The discovery could reveal a previously unknown psychoactive compound and offer new insights into how the human brain creates visual experiences.
For nearly a century, people living in different parts of the world have reported an extraordinary experience after eating certain wild mushrooms: seeing dozens or even hundreds of tiny human figures moving around them. These miniature characters appear surprisingly real, walking around objects, climbing over surfaces and interacting with their surroundings.
Now, scientists have identified a mushroom species, Lanmaoa asiatica, associated with these unusual hallucinations in Southwest China and the northern Philippines. The discovery offers a possible biological explanation for a mystery that has puzzled researchers for decades.
Even more intriguing, scientists have not found any known hallucinogenic compounds in the mushroom that could explain its effects. This raises the possibility that it contains a previously unknown substance capable of altering human perception.
The research, published in the journal Mycologia, could open new avenues for studying the brain, visual hallucinations and the remarkable chemical diversity of fungi.
What Are Lilliputian Hallucinations?
The visions caused by this mushroom are known as Lilliputian hallucinations. The term comes from Gulliver’s Travels, the famous novel by Jonathan Swift, in which the main character encounters a society of miniature people called Lilliputians.
People experiencing these hallucinations often report seeing tiny figures measuring between three and 30 centimetres tall. The figures may resemble elves, clowns or fairy-like characters dressed in brightly coloured clothing.
What makes these experiences particularly unusual is their apparent realism. Rather than simply appearing as vague shapes, the tiny figures seem to follow the rules of the physical world.
They may walk around furniture, climb across objects or fall from the edges of tables. In one reported account, a person eating soup described seeing miniature people jumping from a spoon into the bowl and swimming around in the liquid.
Such detailed and convincing visions have made the phenomenon especially interesting to scientists studying how the brain interprets reality.
A Mystery That Began Nearly 100 Years Ago
Scientific interest in these strange experiences dates back to 1934, when reports emerged from Papua New Guinea describing miniature human figures appearing after people consumed wild mushrooms.
Researchers initially suspected that certain mushrooms belonging to the Boletaceae family were responsible. During the 1950s and 1960s, anthropologists and mushroom specialists investigated the phenomenon, hoping to identify the substance behind the visions.
However, chemical testing failed to provide a clear answer. Even Albert Hofmann, the Swiss chemist known for isolating psilocybin and discovering LSD's psychedelic effects, was unable to identify a compound that explained the hallucinations in the mushroom samples examined.
Without a confirmed chemical explanation, some researchers suggested that cultural traditions and local beliefs might influence the reported experiences. Scientific investigations gradually lost momentum towards the end of the 1960s.
The mystery returned during the 1990s, when similar reports emerged from Yunnan province in Southwest China. Residents described seeing miniature people after eating certain bolete mushrooms, later suspected to include Lanmaoa asiatica.
A further breakthrough came in 2024, when researchers learned of similar experiences among an Indigenous community in the northern Philippines.
DNA Testing Identifies the Mushroom
Colin Domnauer, a doctoral researcher at the University of Utah, and Bryn Dentinger, a mycologist affiliated with the university and the Natural History Museum of Utah, investigated these reports.
In China, the mushroom is locally known as “Jian shou qing”, while communities in the Philippines call it “Sedesdem”. Related reports from Papua New Guinea describe a mushroom known as “Nonda”.
Researchers interviewed local residents and collected mushroom specimens in China and the Philippines. They then used DNA sequencing to establish the mushrooms' identities and examine their evolutionary relationships.
The results showed that the mushrooms associated with the hallucinations in China and the Philippines belonged to the same species, Lanmaoa asiatica.
This was a surprising finding because scientists had previously believed the species occurred only in China.
Although researchers could not obtain suitable specimens from Papua New Guinea because of unusually dry weather, the similarities between the three regions provide an important clue. People separated by thousands of miles have described remarkably similar experiences associated with locally consumed wild mushrooms.
The genetic evidence from China and the Philippines strongly supports a biological explanation, although the precise cause of the hallucinations remains unknown.
An Unknown Psychoactive Substance
One of the most important findings is that researchers found no evidence of familiar psychoactive compounds, including psilocybin, that could explain the mushroom's unusual effects.
This distinguishes L. asiatica from many better-known psychedelic mushrooms.
Scientists suspect that the species produces an unidentified substance that affects the brain in a distinctive way. However, the compound has not yet been isolated or chemically identified, and researchers do not know exactly how it produces the visions.
The mushroom's effects also appear to differ from many commonly described psychedelic experiences. Instead of primarily producing changes in colours, patterns or the perceived shape of objects, it has been associated with detailed visions of miniature human figures interacting with the environment.
Identifying the suspected compound is therefore the research team's next major objective. It could reveal a new class of psychoactive chemicals and help scientists investigate how specific substances influence visual perception.
Importantly, the findings do not mean that the mushroom is safe to consume. Its chemical effects remain poorly understood, and its unusual hallucinations are a reason for caution rather than experimentation.
What Can the Mushroom Teach Us About the Brain?
Lilliputian hallucinations are not exclusive to mushroom consumption. Similar experiences have been reported in people with certain neurological conditions, dementia, macular degeneration and alcohol withdrawal.
These observations suggest that miniature-figure hallucinations may be connected to the way the brain processes and interprets visual information.
Human vision is not simply a matter of the eyes recording everything around us. The brain actively organises sensory signals, recognises objects and constructs the visual experience we perceive as reality.
When these processes are disrupted, a person may see things that are not physically present. However, the precise mechanisms behind Lilliputian hallucinations remain poorly understood.
L. asiatica could provide researchers with a valuable opportunity to investigate these processes. If scientists identify the chemical responsible, they may be able to study its effects on the nervous system and determine which brain pathways are involved.
Such work could eventually contribute to a better understanding of hallucinations associated with neurological disorders. Any medical applications, however, would depend on further laboratory and clinical research.
Four New Mushroom Species Discovered
The investigation also revealed important findings about fungal biodiversity.
Researchers examined 53 specimens from natural habitats and preserved fungal collections as part of a broader genetic study of the Lanmaoa genus.
Their analysis identified 17 species, including four previously unknown to science. Remarkably, two of these newly recognised species had already been preserved in collections in the United States, but their distinct identities had gone unnoticed.
The findings demonstrate how DNA sequencing can uncover hidden biodiversity, even among specimens collected years ago.
Researchers are also investigating the evolutionary history of these mushrooms to understand how their different characteristics developed and whether related species might produce similar chemicals.
A Small Mushroom With Big Scientific Potential
The discovery of Lanmaoa asiatica highlights how much remains unknown about fungi and their effects on living organisms.
Fungi have already contributed enormously to medicine. Penicillin, for example, originated from a fungus and transformed the treatment of bacterial infections. Other fungal compounds have also become valuable tools in biological and pharmaceutical research.
Scientists hope that exploring fungal diversity will reveal further substances with important scientific or medical applications.
For now, the mystery of the tiny human figures remains only partly solved. Researchers have identified a mushroom linked to the phenomenon, but the chemical responsible for its effects is still unknown.
The next step is to isolate that substance and determine how it interacts with the human brain. If successful, the research could do more than explain one of nature's strangest hallucinations. It may also help scientists understand how the brain builds our experience of the world—and how that experience can sometimes be dramatically altered.
The study: Colin Domnauer and Bryn T. M. Dentinger, “Phylogenomic systematics of Lanmaoa (Boletaceae) reveals cryptic diversity, resolves global evolutionary relationships, and suggests a novel psychoactive lineage.” Mycologia, 2026, 118(4): 732. DOI: 10.1080/00275514.2026.2670968.
Comments
Post a Comment