This herb (fungus) is
Dong Chong Xia Cao in Chinese, has a Latin name -
Cordyceps sinensis. Its nickname is
Chinese caterpillar fungus.
Mushrooms are also funguses (fungi), and we eat those and put them into soups and other foods.
You can read about it at these URLs:
(1) Andrew Weil, M.D. --
http://www.drweil.com/drw/u/id/REM00021He sells an "energy formula" of 3 ingredients, and 1 of the ingredients is cordyceps.
http://www.drweil.com/drw/u/id/ART00426(2) Traditional Chinese explanation --
http://tcm.health-info.org/Herbology.Materia.Medica/dongchongxiacao-properties.htm