Acorn. Acorn is the fruit of oak tree, and its surface color is dark maroon. The "cocoon" on this tree is acorn, and acorn powder can usually be drunk with water. Acorn, alias: scientific name chestnut cocoon, Mongolian oak, alias acorn tree, oak tree and Mongolian oak. Most of them refer to the nuts of Quercus plants, and there are many in Anhui and Dongshan areas of Dabie Mountain, which are similar to silkworm cocoons, so they are also called chestnut cocoons.