The brown cap is 3–10 centimetres (1–4 inches) wide with flattened reddish-brown fibrils.

[4] It also bears strong similarities to A. argenteus, A. augustus, A. hondensis, A. porphyrocephalus, and A. rutilescens.

[3][5] The only potential lookalikes of A. cupreobrunneus that are poisonous are yellow- or red-staining, or occur in much different habitats.

[4] Agaricus cupreobrunneus tends to fruit in disturbed areas and grassy places, such as lawns, pastures, and roadsides.

[5] A. cupreobrunneus is not currently cultivated on a widespread basis, but is commonly eaten by collectors in the areas in which it grows.