Cordyceps sinensis, or YartsaGuenboob in Nepali or yartsa gunbu in Tibet, is an herb used since ancient times that resembles peculiar. It is composed of two parts that is a part of worm and part of grass. (Actually, it is a fungus). It tastes bitter-sweet. It is a medicinal plants rare species. In the Qing Dynasty, it has been mistaken about this herb. They believe that in winter it is a worm, but when the summer it becomes grass. And if not kept it before winter to comes, it will change the worm again. Therefore, it is known in short name that chong cao or the grass-worm.
Cordyceps sinensis fungus is looking like a grass that looks like a worm.
But actually it is worms which eat crops fungi as food. When ingested in large quantities, it is dead. And when summer arrives, tropical climate makes the seeds will grow in the worm. It grows out of the head of the worm. Looking it is grass that looks like a worm.