Willow bracket - Phellinus igniarius

"Alder" willow bracket: on old grey alder (Alnus incana). Perennial mushroom. I have been visiting since 2012. During this period, the form was very different. In the beginning, there were two "cameras", and the lower part was flat like a board. in 2015 the edge was very rough. And now it's like it's a completely different mushroom again.

1). in 2012

2). in 2015

3) - 5). in 2020

6). Willow bracket on the other white tooth.

7). 02/28/2021 (same as 1-5)