Milking bonnet or Common 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 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.

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 when young, turning pinkish with age, moderately crowded, with distinctive cross-veins between them. 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 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.

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

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.

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

Faint; in some populations with a note of flour (like fresh bread) or radish. Not distinctive enough for a confident ID.