Fuscoporia obliqua
Which they say grows on Silver Birch. Maybe they mean that they
studied the mushroom that was found on white birch. The
experts are using the old name for Inonotus obliquus here. I think they
are not keeping up with the changes in the scientific names or these articles
were written before the name change. Another example where there is an
advantage of using the Russian common name Chaga. It is generally known
that this mycelium conk has similar medical properties whether it is found on
White, Yellow or Black Birch. In the first article it states that this
mushroom grows in Asia. It grows anywhere there is a winter. It has
been reported in Russia, Scandinavia, Alaska, Canada and the USA. It is
common here in Massachusetts. Also in the first article it states that it
grows on top of Silver Birch. This could be a translation error since it
does not grow on top of the tree. It is found growing from the surface of
the main trunk anywhere from ground level up.
Fuscoporia
obliqua, as a traditional herbal medicine