|gills on hymenium|
|cap is convex|
|hymenium is adnexed|
|stipe is bare|
|spore print is black|
|ecology is saprotrophic|
Panaeolus antillarum is a common and widely distributed small to medium-sized gray mushroom which grows on dung. It is edible but not commonly eaten. Found from northern North America through Mexico into northern South America.
- Cap: 3 to 6 cm, bell-shaped to convex, white to light gray or yellowish, The caps are thick, smooth, often with fine wrinkles and acquire a silver white shiny color in age.
- Gills: Gray in young specimens, turning black as the spores mature.
- Spore print: Jet black.
- Stipe: 4 to 22 cm long and .5 to 2 cm thick, solid, sometimes slightly larger at the base.
- Taste: Fungal.
- Odor: Fungal.
- Microscopic features: Spores ellipsoid, 15 - 20 (21) x 10 - 14 x 8 - 10(11) μm. Cheilocystidia cylindrical to narrowly utriform, colorless, 30 - 45 μm. Sulphidia clavate, sometimes with a stalk, 25 - 50 μm. Basidia four spored, 30 - 35 micrometers long.