Chlorophyllum molybdites, also known as The Vomiter or False parasol, is a large agaric with a white hat that has coarse brownish scales. It grows in a variety of habitats, including grassy areas, lawns, meadows, and woodlands, often forming large fairy rings in summer and fall. The mushroom is commonly confused with the Parasol Mushroom, the Shaggy Parasol, or the Shaggy Mane.

Cap convex to bell-shaped and has a slightly incurved margin when young, expanding to a broadly convex shape as it matures. The surface is first covered by a thin layer of shiny, pale pinkish-buff volva tissue that soon cracks into scales, exposing the white cap surface. The scales are brown to pinkish-brown or tan, either uplifted or flat, and usually concentrated near the centre. The flesh is thick, and white throughout. Gills close, broad, free and remote from the stem, pale yellowish but becoming greyish green to brownish green as the spores mature. Stem slender, enlarged towards the base, white to brownish and bears a double-edged ring that is white at first but becomes brown and scaly on the underside. Spore print dull grayish green.

Microscopic Features: The spores measure 9-13 x 6-9 µm and have an amygdaliform to ellipsoid shape. They are smooth and slightly truncated at one end, featuring a small 1 µm pore. The spores have thick walls and appear hyaline (colourless) to faintly greenish in KOH (potassium hydroxide). Additionally, they exhibit dextrinoid properties.

Chlorophyllum molybdites on the MushroomExpert.Com Web site.
Identifying the Most Common Poisonous Mushroom: Chlorophyllum molybdites on the Foraged Foodie Web site.

The seventh photo is by Sylvia and licensed under the Creative Commons Attribution 3.0 Unported license.