Geastrum fimbriatum, commonly known as the fringed earthstar or the sessile earthstar, is an inedible species of mushroom belonging to the genus Geastrum, or earthstar fungi.
First described in 1829, it is distinguished from other earthstars by the delicate fibers that line the circular pore at the top of its spore sac. The species has a widespread distribution, being found in Eurasia and the Americas.