Many soil and plant fungi produce sclerotia — tough balls of cells that are usually 0.02 inches to 0.08 inches (0.5 millimeters to 2 millimeters) in size — as a way to survive periods of harsh conditions. Their shape can vary from spherical to elongated, and their internal structures, which can take on a spongy or honeycomb pattern, matches the descriptions given by Dryas- impact event proponents.