《搜神记·卷六》
汉元帝永光二年八月，天上落草，草叶子互相缠绕，象弹子一样大小。
汉元帝永光二年八月，天雨草，而叶相樛结，大如弹丸。
In the second month of the second year of Yongguang (AD 26) during the reign of Emperor Yuan of Han, grass fell from the sky. The blades of grass were twisted together and were about the size of marbles.