Geastraceae - a family of earthstar fungi belonging to the order LycoperdalesLycoperdales, order Lycoperdales - small order of basidiomycetous fungi having fleshy often globose fruiting bodies; includes puffballs and earthstars earthstar - any fungus of the family Geastraceae; in form suggesting a puffball whose outer peridium splits into the shape of a star Geastrum, genus Geastrum - type genus of Geastraceae; fungi whose outer peridium when dry splits into starlike segments |