| Noun | 1. | Scleroderma flavidium - an earthball with a smooth upper surface that is at first buried in sand; the top of the fruiting body opens up to form segments like the ray of an umbel genus Scleroderma, Scleroderma - genus of poisonous fungi having hard-skinned fruiting bodies: false truffles earthball, hard-skinned puffball, puffball, false truffle - any of various fungi of the genus Scleroderma having hard-skinned subterranean fruiting bodies resembling truffles |