Fomitopsis officinalis

About

Laricifomes officinalis, also known as agarikon, eburiko, or the quinine conk, is a wood-decay fungus that grows in large conks on the trunks of trees. It causes brown heart rot on conifers in Eurasia, Morocco, and North America. This fungus is the only member of the genus Laricifomes.

Summary from Wikipedia