Many Iowans have recently noticed large, white fungal spheres emerging from the ground in lawns, prairies, and forests. These puffballs are the fruiting structure of a fungus, and come in a variety of sizes. Perhaps the most common species of puffball is the giant puffball, Langermannia giganteum (formerly Calvatia gigantea). This puffball can grow up to a foot or more in diameter, appearing as a large, white ball. At first it has the texture of a marshmallow, but as the puffball matures it turns olive-brown, and the interior becomes spongy and filled with spores.
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