L. asiatica

"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."

Read more: 'They saw them on their dishes when eating': The mushroom making people hallucinate dozens of tiny humans via the BBC