
(1/2) The Fermilab site continually surprises with its wonders of nature, this time with huge mushrooms. One, two and maybe more: These are Calvatia gigantea, commonly known as giant puffballs. Mushrooms tend to grow in groups. Photo: Aleksandr Romanov

(2/2) A dollar bill is shown for scale. The big mushroom is well above recently cut grass. Photo: Aleksandr Romanov