Leucoagaricus americanus which we know as the American umbrella is a fungus in the Leucoagaricus family. I often find this fungus growing in sawdust/wood dust, on stumps, and on the surface of peat soil which has high humidity levels. The umbrella or cap measuring 3-20cm is oval at a young age, and turns convex and flat when mature. The upper surface of the umbrella is dry and smooth at a young age as it ages and becomes reddish to reddish brown scales. The color is white but will turn red when it is ripe, this color change can also occur after a few minutes of holding it.