Gasteromycetes, or puff balls, as a rule, have no stalk; they lie on the ground. The powder comes with age and is chiefly composed of mycelia or spores. The largest is the Lycoperdon Giganteum, and grows to a circumference of forty inches. The flesh is white or yellowish and firm, and edible before it becomes powder. Another puff ball, edible, as most of them are before the powder forms, is Lycoperdon Cyathiforme. There is one species of puff balls which is poisonous, and it grows around houses, the Scleroderma Vulgare. The exterior is yellow and warty, and the inside is purple or black, with white. None of these puff balls are sufficiently attractive as food, unless one is starving, to cause one to run a risk of eating Scleroderma Vulgare for Lycoperdon Cyathiforme. Dr. Farlow well says, "When you are in doubt, never eat a fungus."