Amanita smithiana
The cap has a diameter of 5–17 centimetres (2–6+1⁄2 inches) and is white and scaled with remnants of the universal veil.The specific epithet honors mycologist Alexander H. Smith, who collected the type specimens from Washington in 1941.It is responsible for poisonings in the Pacific Northwest when mistaken for the edible and sought after Tricholoma murrillianum (matsutake).It causes initial gastrointestinal symptoms that manifest 1 to 12 hours after eating the mushrooms,[4] followed by acute nephritis after a delay of 2–6 days.Hemodialysis appears to be an effective treatment and most patients recover normal kidney function within several weeks of ingestion.