Epithelantha micromeris is a button cactus in the genus epithelentha. It is characterized by its white-grey spines growing as globe shape. The density of spines give it the illusion of being completely grey, making it very difficult to see the green color beneath. It grows to be 1–5 cm tall, and roughly 2–4 cm in diameter. E. micromeris produces small, pink-white flowers, often considered to be some of the smallest of the cacti.