Every year, doctors at a hospital in the Yunnan Province of China brace themselves for an influx of people with an unusual complaint. The patients come with a strikingly odd symptom: visions of pint-sized, elf-like figures – marching under doors, crawling up walls and clinging to furniture.
The hospital treats hundreds of these cases every year. All share a common culprit: Lanmaoa asiatica, a type of mushroom that forms symbiotic relationships with pine trees in nearby forests and is a locally popular food, known for its savory, umami-packed flavor. In Yunnan, L. asiatica is sold in markets, it appears on restaurant menus and is served at home during peak mushroom season between June and August.
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The academic literature provided a few breadcrumbs. In a 1991 paper, two researchers from the Chinese Academy of Sciences described cases of people in Yunnan Province who had eaten a certain mushroom and experienced “lilliputian hallucinations” – the psychiatric term for the perception of tiny human, animal or fantasy figures. It is so named after the small people who inhabit the fictional Lilliput Island in the novel Gulliver’s Travels.
The patients saw these figures “moving about everywhere”, the researchers wrote – usually, there were more than ten tiny beings on the scene. “They saw them on their clothes when they were dressing and saw them on their dishes when eating,” the researchers added. The visions “were even more vivid when their eyes were closed”.
It makes me think of a story from the manga The Kurosawa Corpse Delivery Service. There it was a new variety of herpes virus that caused people to have the hallucinations, but I suspect the writer had read something about the 1991 paper, lots of the Kurosagi stories are riffing off urban legends and news stories.
