This genus has black spores. The lamellae are waxy, and grow downward on the stem.

Genus Psathyrella

The members of this genus are fleshy fungi, with black spores. They have no annulus, and the lamellae are not waxy or decurrent. The cap is striate, and the stem has a hard, tough rind.

Genus Panaeolus

There are six or more species of this genus in America. They have black ovoid spores, a cap smooth and not striate, a fleshy stem.