That is both very interesting and very kind of you. Thank you for introducing us to a new kind of mushroom.
If you can get some perhaps you should enjoy some Butters Stotch.
Perhaps Chuga mushrooms might grow in climates that are similar to the climate where they grow in Russia. It might be available for purchase in other countries. It might also be know by other names in some countries.
Since I never heard of it I was very curious and I found some information about Chuga mushrooms here.
http://en.wikipedia.org/wiki/Chaga_mushroom
In general many kinds of mushrooms seem to have beneficial health properties. I am going to ask my naturopathic physician if he has ever heard of it.
Perhaps our resident dietician, Tanya has some information she can share with us about it.
Take good care of yourself.