A walk through the forest at this time of year may lead to the discovery of what appear at first glance to be giant marshmallows. A closer investigation reveals that the spheres are composed of a soft spongy material – rather than a soft sticky material. These objects are puffballs, produced by certain soil-dwelling fungi. There are a number of different species of fungi that form puffballs and they can be found growing on the ground in forests, pastures and lawns. Read more about Puffballs and Stinkhorns and Fairy Rings, Oh My!