I n the United States there are about 5,000 types of mushrooms. Less than a dozen species are considered deadly. This is incorrect.
Many mushrooms are poisonous and some toadstools are edible.
There are eight categories of mushrooms that can cause a variety of symptoms. Just because a victim does not have any symptoms in the first couple of hours does not mean everything will be all right. Ingestion of some mushrooms cause six hours of intense vomiting which can be severe enough to require hospitalization. Some cause unpleasant hallucinations, which can be severe enough to require hospitalization, and some cause problems only if taken with alcohol. Other mushrooms can cause symptoms that resemble alcohol intoxication along with muscle spasms and visual disturbances.