Agaricus xanthodermus (Yellow Stainer)

Medium to large gregarious mushrooms often growing in disturbed sites. The immature whitish cap is almost cylindrical with a flattish top, giving it a square look. With growith the the cap becomes convex and later tends to flatten. In maturity it becomes greyish with thin brown scales.

Fresh specimens stain chrome yellow when rubbed briskly - hense its common name of 'yellow stainer'.

Gills - free, white to pink, crowded, becomong dark purple brown as spores mature, various lengths.

Annulus distant.

Often has an unleasent smell reminiscent of kerosene / phenolic smell.

Spore print Chocolate brown

Saprotrophic

POISONOUS to most people