The term "puffball," as I am using it here, is not at all scientific; I mean more or less any mushroom that looks like a ball when mature. Typically the interior of a puffball is composed of spore-producing flesh that turns into spore dust as the mushroom matures. When the puffball matures it splits open, or a perforation develops on surface of the ball, through which the spores escape—when raindrops land on the puffball, via air currents, or by some other means...