Petticoat mottlegill or Egghead mottlegill

The cap is 1.5 to 4 cm across, occasionally 5 cm. It starts egg-shaped or bluntly conical, then becomes bell-shaped and never flattens. It's grey-brown, pale brown or greyish, sometimes with reddish or olive tints and a darker centre. In dry weather it pales and often cracks.

Young caps have white triangular veil teeth hanging from the rim. They rub off easily, so older caps may have none.

The cap is 2 to 6 cm across, sometimes up to 9 cm. It's egg-shaped when young, then like half an egg or a blunt cone, only rarely convex. The margin isn't lined; it overhangs the gills and sometimes carries scraps of veil.

It's whitish, cream or pale clay-coloured, darker in the centre, and fades with age. When wet it's sticky; when dry it's smooth and shiny, often wrinkled or cracked.

The gills are attached and crowded, grey at first, then mottled grey and black as the spores ripen in patches, and finally black. The gill edges are white.

The spore print is black.

The gills are attached, crowded and broad. They start off whitish or greyish, become mottled with black patches and end up black, with whitish edges.

The spore print is black.

The stem is 5 to 12 cm tall and 2 to 4 mm thick, long and slender for the cap, the colour of the cap or paler, finely powdered at the top and darkening towards the base. It's hollow and brittle, with no ring.

The stem is 6 to 15 cm tall and 3 to 10 mm thick, long and slender compared with the cap, whitish or cap-coloured, paler and finely powdery at the top, slightly swollen at the base, brittle and hollow.

Above the middle there's a thin white ring that turns black on top from spores. It's fragile and can fall off, so look for it on young specimens.

The flesh is thin and pale.

The flesh is thin, soft and whitish, pale yellowish and brittle in the stem, and doesn't change colour when cut.

The smell isn't distinctive.

The smell is indistinct.