About Leucoagaricus americanus (Peck) Vellinga
The cap of Leucoagaricus americanus is oval when immature, and matures to a convex or flat shape, reaching 3–15 centimetres (1+1⁄4–6 inches) wide. When young, the cap is dry and smooth, and gradually develops reddish to reddish-brown scales. It is white when young, and turns reddish as it matures or after it is handled. The gills are free from the stipe, are closely spaced, white when young, and stain pinkish to maroon. The stipe measures 7–14 cm long, is often enlarged at or below the middle and tapers toward the base. It is white when young, and stains or ages pink or reddish brown. Its surface is smooth with silky hairs. A membranous veil leaves a white double-edged ring on the upper section of the stipe, which may disappear as the mushroom ages. The spores are white to cream in color, and measure 8–10 by 6–7.5 μm. The flesh is uniformly white. When cut, it bruises yellow to orange, and develops red coloration when the mushroom is old or dried. The flesh is thick, and changes color when cut, bruised or damaged. Leucoagaricus americanus is reported to be edible, but consumption is not recommended due to risk of confusion with toxic species such as Chlorophyllum molybdites. This species is widely distributed across its native range in North America, and is more common east of the Rocky Mountains. It is saprobic, and grows on sawdust, wood chips, stumps, and the ground.
