Shield Dapperling

The cap is egg shaped when young, soon broadly bell shaped and has pale straw- or orange-brown scales on a pale background. The central boss is covered with a well-delimited uniform disk of the same colour as the scales. It grows to 5 cm, rarely up to 8 cm in diameter. The gills are white and crowded, with white spores.
The white stem has an indistinct ring, below which it is coarsely woolly, giving an appearance which is sometimes described as "booted". The stem is long, hollow and slender and expands slightly below into a club shape. The flesh is white and has an unpleasant smell. http://en.wikipedia.org/wiki/Lepiota_clypeolaria