Fungus That Is a Seat for Wonderland’s Caterpillar

Puzzle 4 of Alice in Wonderland Piece of Cake Pack

Question is: Fungus That Is a Seat for Wonderland’s Caterpillar

and the answer is: MUSHROOM

Word Meaning:

MUSHROOM — Any of the fleshy fruiting bodies of fungi typically produced above ground on soil or on their food sources (such as decaying wood).

Definitions from Wiktionary.