Geastrum - type genus of Geastraceae; fungi whose outer peridium when dry splits into starlike segmentsgenus Geastrumfungus genus - includes lichen generafamily Geastraceae, Geastraceae - a family of earthstar fungi belonging to the order Lycoperdales
Geastrum - type genus of Geastraceae; fungi whose outer peridium when dry splits into starlike segments