Milking bonnet or Yellowleg bonnet

Cap 1-2.5 cm across, conical or bell-shaped, with a noticeable bump in the center and fine radial grooves from the margin to the center (a hallmark of the genus Mycena). Color gray-brown, dark gray with an olive tint, the center darker. The cap margin is thin and fragile, often splitting in old mushrooms.

Cap 1-2.5 cm across, bell-shaped or conical with a little bump, becoming convex with age. Color yellowish, yellow-olive, lemon-yellow, darker in the center to brownish-yellow. The surface is noticeably slimy in wet weather — this is the species' main diagnostic feature. You can catch the slime with a fingernail and peel it off as a film. In dry weather the cap is simply shiny, without obvious sliminess. The cap margin is thin, with radial grooves.

Gills — whitish to pale gray, moderately distant, with noticeable cross-veins between them. Attachment to the stem notched with a small decurrent tooth. Spore print white.

Gills — whitish to pale yellowish, moderately distant. Attachment to the stem notched (adnexed). Spore print white.

Stem 4-8 cm tall, 0.1-0.2 cm thick — very thin, threadlike, fragile. Color grayish-white above, dark gray to brownish toward the base. The surface is smooth. When the stem is snapped, a drop of white, milky fluid oozes out — this is the species' main diagnostic feature. In old, dried-out mushrooms the juice may not appear, but a dry whitish trace remains.

Stem 4-8 cm tall, 0.1-0.2 cm thick — very thin, threadlike, fragile, slimy in wet weather. Color yellowish above, darkening with age to yellow-brown toward the base. The surface is smooth, with a noticeable layer of slime.

Flesh very thin, watery, white. Smell faint; in some forms slightly radish-like or chlorine-like. Taste mild, unremarkable.

Flesh very thin, watery, yellowish. Does not change color when cut. Smell faint; in some populations rancid, with a note of old fat or fish. Taste mild, unremarkable.

Faint; in some populations with a note of radish or a damp cellar. Not distinctive enough for an ID.

In some populations — faint, rancid, with a note of stale fish oil or old butter. Not in every find — some yellowleg bonnets have no smell at all.