Agaricus arvensis

Pileipellis with hyphae arranged more or less in parallel, with simple septa, faint yellowish intracellular pigment, and 4 to 12 µm wide.

Cheilocystidia present, scattered, globose to cylindrical or some utriform.

Lamellar trama parallel, without clamp connections.

Basidia 4-spored, clavate, producing subglobose to ellipsoidal spores, brown and thick-walled, with a large lipid droplet inside and a discreet apiculus.