Agaricus squamuliferus or Agaricus romagnesii

Cap 4-9 cm across, hemispherical to egg-shaped when young, becoming convex-flat with age. Color whitish to grayish-cream, with fine brownish or gray-brown radially arranged scales, a distinctive feature of the species. There are more scales in the center and fewer toward the cap edge. The surface is dry, not slimy.

Cap 6-15 cm across; in young mushrooms hemispherical to egg-shaped, later becoming convex to flat. Color brownish-cream to grayish-brown, with distinct small brown or dark brown scales in the center and middle zone. The surface is dry, slightly sticky in wet weather.

Gilled hymenophore: gills free (not attached to the stem), crowded. When young they are pink (a characteristic feature of the genus Agaricus, unlike the white gills of amanitas), and with age they become chocolate-brown to dark brown. Spore print dark brown.

Gilled hymenophore — gills free, crowded. When young — pale pink, becoming with age dark brown, chocolate-blackish. Spore print dark brown.

Stem 5-10 cm tall, 0.8-1.5 cm thick, cylindrical, slightly thickened at the base. Color white to cream. A white membranous ring in the upper part, distinct when young; in older mushrooms it may slip down or dry out. Above the ring the stem is smooth, below it has fine lengthwise fibers.

Stem 8-12 cm tall, 1-2 cm thick, cylindrical, slightly thickened at the base. Color white to cream, with fine brownish fibers below the ring. On the upper part — a white membranous ring, distinct in young mushrooms.

Flesh firm, white; when cut it slowly turns pinkish to brownish, especially in the lower stem. This is the classic protective feature of the genus Agaricus against Amanita. In amanitas the flesh does not change color. Pleasant mushroomy smell with an almond note.

Flesh firm, white; when cut it slowly turns pinkish to brownish. Does not turn chrome yellow (the test against the yellow stainer). The smell is pleasantly mushroomy with a subtle almond-anise note.

Pleasant and mushroomy, with a subtle almond-anise note, typical of many Agaricus species. It does not smell of ink, medicine or carbolic (if it does, it is the yellow stainer: do not eat it).

Pleasantly mushroomy, with a subtle almond-anise note. It doesn't smell of ink or medicine.