Cap hemispherical during the so-called button stage, and then expands, becoming convex to broadly convex or nearly flat. The cap cuticle is dry and densely covered with concentrically arranged, brown-coloured scales on a white to yellow background. The flesh is thick, firm, and white and may discolour yellow when bruised. Gills are not attached to the stem, crowded and pallid at first, and turn pink then dark brown with maturity. Stem solid, cylindrical to club-shaped and no volva. Whitish and fairly bald above the membranous ring, but below the ring covered with whitish to faintly brownish scales. Spore print purple-brown.
Microscopic Features: The spores are ellipsoidal in shape, with a smooth surface. They measure approximately 7-10 μm in length and 4.5-6.5 μm in width.
Agaricus augustus on the First Nature Web site.
Agaricus augustus on the MushroomExpert.Com Web site.
The first photo is by George Chernilevsky under the Public domain license.
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