Yellowleg bonnet or Nitrous bonnet

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.

Cap 0.5-1.5 cm across, conical or bell-shaped with a sharp little bump, with radial grooves. Color gray-brown, ash-gray, darker in the center. The surface is smooth, slightly damp in rain.

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

Gills — grayish-white, distant. Attachment notched (adnexed). Spore print white.

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.

Stem 4-7 cm tall, 0.1 cm thick — very thin, threadlike, fragile. Color grayish-white above, darker toward the base. The surface is smooth. The base often has whitish mycelium.

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.

Flesh very thin, grayish-white. Does not change color when cut. Smell faint, chlorine-bleach — the main diagnostic feature.

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.

Faint, chlorine-bleach, with a note of household cleaner or freshly sliced cucumber. It comes out when you rub the flesh between your fingers.