How to tell Fool's funnel from White knight

The cap is 2-5 cm across, convex when young, becoming flat and spread out or slightly funnel-shaped, with a thin wavy margin. It's whitish to cream, with characteristic pinkish-cream concentric zones or streaks running from the centre to the margin, a diagnostic feature. The surface is silky-matte and somewhat sticky in wet weather.

The cap is 4–10 cm across. Young caps are conical to convex with an inrolled margin, then flatten out around a small, low boss, often with a wavy edge. In the white knight the margin is smooth; a ribbed margin points more to the chemical knight of birch woods.

The colour is white to cream, sometimes with a pale yellow tinge. With age the centre turns ochre or yellowish brown, and old caps develop ochre spots. The surface is dry, matt and smooth, and stays dry even in rain.

The gills are crowded and thin, running decurrent down the stem (typical of the genus Clitocybe). They're whitish to pale pink. The spore print is white.

The gills are white, later pale yellowish, thick, fairly distant and of unequal length. They are clearly notched just before the stem, and their edges are finely toothed.

The spore print is white. Pink or chocolate-brown gills mean a field mushroom relative; gills running down the stem point to a funnel.

The stem is 2-5 cm tall and 0.4-0.8 cm thick, slender, cylindrical and often curved. It's whitish to cream, with white mycelial fuzz at the base. The surface is smooth, with no ring.

The stem is 3–8 cm tall and 0.8–1.5 cm thick, cylindrical, sometimes slightly wider at the base. It's white to pale yellowish brown, powdery at the top, finely fibrous lower down, and slowly browns when handled.

There is no ring, no veil remnants and no bag-like volva at the base. If you find such a sac, you're holding an amanita.

The flesh is thin, white, watery and brittle, and it doesn't change colour when cut. The smell is faint and sweetish, the taste mild: dangerously "normal".

The flesh is white and firm, thick in the cap, and doesn't change colour noticeably when cut (some authors note a faint pink tint). The taste is acrid and burning, with bitterness.

Faint, sweetish and nondescript, with nothing alarming about it. The taste is mild. Neither the smell nor the taste gives away that it's poisonous.

The smell is strong and unpleasant: sharp like radish, with a sickly sweet note of honey and a mealy edge when cut. Young specimens smell less, mature ones can be smelt from a distance. A nauseating chemical smell, like cooked beetroot or coal gas, belongs more to its relatives, the chemical knight of birch woods and the gassy knight (Tricholoma inamoenum).