Agaricus CampestrisCommon Mushroom (Edible)
Cap or Pileus - Silky, or with fine fibres. The young plants -"buttons" - are hemispherical or almost globose. The mature plants are convex or nearly flat. White, or tinged with dingy browns. Skin separable. Margin extending beyond the gills.
Gills or Lamellae - Delicate pink, then dark brown, covered by a veil in young plants. Crowded, rounded at the inner extremity. Not attached to stem.
Stem or Stipe - White, smooth; stuffed; that is, softer within than without. Shorter than the diameter of the cap.
Ring or Annulus - Delicate, often disappearing with age.
Flesh - White. Much esteemed.
Spores - Brownish, elliptical.
Time - Late summer and autumn.
Habitat - In pastures, lawns, and open places.
Agaricus campestris is the mushroom ordinarily seen in the markets, either fresh from the growers or preserved in cans.