Common bonnet or Yellowleg bonnet

Cap 2-6 cm across; in young mushrooms bell-shaped or conical with a sharp central bump, becoming convex with age while keeping the same bump. Color gray-brown, darker to dark gray in wet weather, paler to beige in dry weather. The surface is smooth, with fine radial grooves from the margin to the center (the gills show through). The cap margin is thin and often splits 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 when young, turning pinkish with age, moderately crowded, with distinctive cross-veins between them. Attachment to the stem notched (adnexed). Spore print white.

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

Stem 5-12 cm tall, 0.3-0.6 cm thick, long, thin, cylindrical, fragile. Color pale grayish-white above, darker toward the base. The surface is smooth. The stem base is often wrapped in whitish, felty mycelium — a characteristic feature of the species on mossy stumps.

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 thin, watery, whitish, more fibrous in the stem. Does not change color when cut. Smell faint; in some populations slightly mealy or radish-like. Taste mild, with a light mealy note.

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 flour (like fresh bread) or radish. Not distinctive enough for a confident 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.