Menthol brittlegill or Milk-white brittlegill

Cap 6-15 cm across; in young mushrooms hemispherical to flat with an inrolled margin, later becoming funnel-shaped. Color pure white when young, turning gray, ash-gray, then blackish with age. Surface smooth, slightly sticky in wet weather.

Cap 5-20 cm across (often very large), convex-flat with a distinctly inrolled margin when young, with age becoming deeply funnel-shaped. The skin is matte white with an ochre-brown center; in adult specimens with noticeable bits of soil and moss stuck to it (because of the funnel shape). Base color white to cream, ochre-brown to brownish in the center. The skin is peels only at the margin, not easily. The margin is even, with a fine felty down when young.

Gilled hymenophore — the gills are attached to the stem, moderately crowded (unlike R. nigricans, where they are distant). In young mushrooms — whitish, when damaged they blacken with no red stage. Spore print white.

Gilled hymenophore — the gills are decurrent, moderately spaced, fleshy, brittle. Color: whitish to creamy white, in the upper part, near the stem, often with a characteristic greenish-bluish tint — a diagnostic feature. Spore print white to creamy white.

Stem 3-7 cm tall, 1.5-3 cm thick, thick, cylindrical. Color white when young, gray to blackish with age. Surface smooth. No ring.

Stem 2-5 cm tall, 2-4 cm thick — very short and thick, even when the cap is large. Cylindrical to conical, thickening toward the base. Color: whitish, in the upper part, with a characteristic greenish-bluish tint, with fine crosswise wrinkled grooves. No ring.

Flesh firm, fleshy, white when young. When cut, it blackens IMMEDIATELY to gray-black, with no red stage — the key difference from R. nigricans. Faint, pleasant mushroomy smell.

Flesh very firm, fleshy, white, brittle. Exudes no milk when damaged (it's not a milk cap!). When cut, it slowly takes on a yellowish tint. Smell faintly mushroomy, with a fruity note in young specimens, taste mild at first, then distinctly burning and acrid (especially in the gills). Boiling removes the acridity.

Faint, pleasant, mushroomy, with no distinctive notes.

Faintly mushroomy with a fruity note in young specimens, nothing striking.