1) Horse Mushroom /Agaricus arvensis .The cap is 7-20 cm, whitish, smooth, and dry.The stalk is 5-12 cm long and 1-3 cm wide.The spores are brown and smooth. 無毒
2)Field Mushroom/Agaricus campestris. The cap is white, may have fine scales, and is 3 to 12 cm. he stipe is 3 to 10 cm tall, 1-2 cm wide.The white flesh bruises a dingy reddish brown.無毒
3) Yellow Stainer/Agaricus xanthodermus.The cap ranges from 5-15 cm.It is whitish, with light brown tints towards the centre.The stipe is 5-12 cm tall and 1-3 wide. It displays a strong yellow colouration at the base of the stem when cut. It is poisonous. 有毒