Coprinopsis melanthina

Cellular cutis formed by spherical, subglobose to ovoid hyphae, hyaline.

Caulocystidia abundant, cylindrical, sinuous and mostly slightly ventricose.

Cheilocystidia very abundant, rendering the lamellar edge practically sterile, fusiform to utriform, hyaline.

Pleurocystidia not observed.

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

Spores very pale, with only faint ochraceous granular content, ellipsoidal, smooth-walled, with an eccentric apiculus at one end, inamyloid in Melzer's reagent.