1. Muscarine pronunciation: dúxùnjiǎn; Muscarine is a natural alkaloid, toxic, mainly found in fungi of the genus Silkia and Cup, such as Frost Cup umbrella. Muscarine has also been found in fungi of the genera Erythrium spp. and Trichoderma spp. to contain toxic amounts of muscarin when ingested.

2. Harmless trace amounts of muscarine are also found in fungi of the genera Boletus, Amanita, Lactobacillus and Russula. Some fungi have variable muscarinic content, such as Amanita muscaria, which typically accounts for 0.0003% of fresh weight, compared to fungi of the genera Amanita and Coccinella, which can contain up to 1.6% muscarine.