Ada and her dad spotted these excellent puffballs last week. Puffballs are fungi that look just as their name suggests—like puffy balls, growing, usually without a stem, on dirt or grass or even wood. Some puffballs are small; some grow to giant size, almost 20 inches across. They belong to several families of mushrooms and fungi, not just one. Their spores live inside their globulous bodies, which break open when they mature, releasing the spores into the air. Have you found any interesting mushrooms this summer?