Zenmai Watage is very famous Tenkara Kebari(Fly) body dubbing material for traditional flies. Zenmai is Japanese Osmund. It is also very popular Sansai(Mountain plant) which is very tasty high quality food.
This Zenmai has floccus and old tenkara fishers used this part as a body dubbing material. We call it Zenmai-dou flies.
You can use this material just like poliyarn dub. Crip on a thread and ty on a hook.
Please note this is 100% natural material and it has some dusts and trash in the package.