Agarikon, known as Laricifomes officinalis, for those specimens found on larch trees (Larix species), and Fomitopsis officinalis, which applies to those hosted by Douglas fir, spruce, and hemlock. Agarikon is a polypore mushroom that is native to North America and Europe. There have been several studies conducted on the medicinal properties of Agarikon, one of which was done at the Institute for Tuberculosis Research at the University of Chicago, where it was determined that the mushroom does contain anti-tubercular properties*.
There was another study conducted by the National Institutes of Health and the U.S Army Medical Research Institute of Infectious Diseases on the wake of the 9/11/01 attacks. After testing several mushroom strains, they found that Agarikon showed exceptionally strong activity against viruses including pox (cowpox), swine (H1N1) and bird (H5N1) flu, and herpes (HSV1, HSV2) viruses.
*These statements have not been evaluated by the Food and Drug Administration