sentences:  The specific epithet "craniiformis" derives from the Ancient Greek words "cranion", meaning "brain", and "forma", "a form".The fruit bodies of "Calvatia craniiformis" grow to dimensions of tall by wide, and have a form ranging from pear-shaped, to flattened-spherical, to obovate (roughly egg-shaped), to tunicate (like an inverted cone).At the bottom is a thick, often crumpled base attached to a cord-like rhizomorph, which is often encrusted with surrounding soil.