Lookalikes to rule out
Horse Mushroom
deadlyAgaricus have gills that turn pink to brown and no volva.
Puffballs
deadlyCut every white button vertically; Amanita eggs show gills and a cap outline.
St George's Mushroom
deadlySt George's mushroom fruits in spring and has no ring or volva.
Identification
Everything is white. The cap is conical to bell-shaped, often lopsided. The stem is shaggy with woolly scales and carries a fragile ring that may disappear. The base sits in a large, loose, sac-like volva, often buried. Gills are white and free.
Why it matters
Like the death cap, this species contains amatoxins that destroy liver cells. Symptoms begin 6 to 24 hours after eating, followed by a deceptive improvement and then liver and kidney failure.
Memorable fact
Its old English name, destroying angel, was given for its combination of purity of color and extreme toxicity.
