Yellow knight or Soapy knight

Cap 5-12 cm across, when young convex with an inrolled margin, becoming with age flattened-expanded with a small bump. The skin is smooth, slightly slimy in wet weather, dry and matte in dry weather. Color: very variable — gray-white, olive-gray, greenish-gray, brownish-gray, in some forms almost black in the center. Old fruiting bodies have small cracks.

Cap 4–12 cm across, flat-convex or with a low hump in the center. Surface yellowish green or olive yellow, dry or slightly moist, often darker in the center with characteristic small fibrous scales. Margin uneven, wavy.

Gilled hymenophore — the gills are notched (sinuate) where they attach to the stem, moderately crowded, fleshy. When young they are whitish, becoming with age creamy-grayish, often turning pink when damaged. Spore print white.

Gills crowded, yellow or yellow-green (the same color as the cap or brighter) — the yellow gills are one of the key identification features. Attached to the stem. Spore print white.

Stem 5-10 cm tall, 1-2.5 cm thick, firm, cylindrical, thickening toward the base when young. Color: whitish to grayish; pinkish-red spots often appear when damaged — a diagnostic feature. Surface smooth with lengthwise fibers. No ring.

Stem 4–8 cm tall, 1–2 cm thick, firm, solid, cylindrical, yellowish or yellow-green, partly buried in sand. No ring and no volva.

Flesh firm, white, develops pinkish-red spots when cut or pressed, especially in the lower part of the stem — a characteristic reaction and an important diagnostic. Smell distinctly soapy (laundry soap), taste soapy-bitterish, unpleasant.

Flesh firm, white or slightly yellowish. Does not change color when cut. Taste mild, mealy or slightly radish-like. No bitterness.

Distinctly soapy — reminiscent of laundry or toilet soap. A diagnostic feature, especially clear when cut and in mature fruiting bodies.

Smell mealy, slightly cucumber- or radish-like — typical of many Clitocybe and Tricholoma species. No repulsive notes. In some specimens the aroma is stronger and reminiscent of fresh flour.