Coprinopsis marcescibilis

Suprapellis with a layer of filamentous, hyaline hyphae with simple septa (without clamp connections).

Subpellis with broader hyphae and short cells (hymeniform layer), hyaline like the suprapellis.

Lamellar edge sterile, completely covered with bottle-shaped, ventricose cheilocystidia, some necked, ending rounded, hyaline with slight oily content at the apex.

Pleurocystidia not observed.

Basidia clavate, very short, strongly widened at the apex, 4-spored.

Spores broadly ellipsoidal, dark brown, smooth, with a slightly eccentric apiculus at one end and a central germ pore at the opposite end.