Pyrrosia lingua (Thunb.) Farw.
Engl.: felt fern, tongue fern.
TCM: shi wei.
Bot. syn.: Acrostichum lingua Thunb., Niphobolus lingua (Thunb.) Spreng., Polypodium lingua (Thunb.) Sw.
Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.