Panaeolus semiovatus var. phalaenarum is a common and widely distributed medium-sized grey mushroom that grows on dung.
Panaeolus semiovatus var. phalaenarum is often mistaken for Panaeolus semiovatus.
The binomial Panaeolus antillarum that previously referred to a closely related species, is now reduced to synonymy with Panaeolus semiovatus var. phalaenarum by most authorities.
Panaeolus semiovatus var. phalaenarum is a medium-sized mushroom which has a cap that is 2 to 4 cm, convex, and is white to yellowish. Often mistaken for its larger cousin Panaeolus semiovatus var. semiovatus, from which it differs in being more slender and having no annulus (ring).[1]
This mushroom prefers tropical climates.