Agaricus campestris, commonly known as the Meadow Mushroom, is a medium-sized agaric with a white to brownish cap on a short stem with an indistinct ring and no volva. The mushroom grows solitary or grouped, often in fairy rings, on grassy soil in lawns, pastures or in cultivated fields.
white (may have fine scales) at first hemispherical in shape before flattening out with maturity. Flesh thick, firm, white, but slowly becoming flushed with pink to purplish brown. Gills
free from the stem, narrow, pale pink at first, becoming bright pink, then dark purple-brown when spores mature. Stem
short, cylindric or tapered toward the base, predominantly white and bears a single thin ring.
There are several similar species in the Agaricus genus. One is the slightly poisonous Agaricus xanthoderma, which has a yellow-staining surface. Another look alike is Agaricus augustus
which is more fleshy. Also species outside the Agaricus genus can be confused with Agaricus campestris, like for example Hebeloma crustuliniforme
which is poisonous. Be careful not to confuse it with the deadly poisonous amanita species, like Amanita virosa
, which has white gills but can look similar.
on the www.first-nature.com web site.