Agaricus campestris

Cuticle (pileipellis) filamentous, composed of hyphae arranged in parallel, hyaline and without clamp connections.

Lamellar edge without elements differentiated from basidia or basidioles.

Basidia clavate, 4-spored, widened at the apex.

Spores ellipsoidal, thick-walled, brown under the microscope, with an internal droplet and a distinct lateral apiculus.