Alnus rubra
"Bruceomyces castoris" was isolated from the sap and chewed wood found in beaver teeth scars at the base of living grand fir trees in a wooded area by a beaver pond in Polk County, Oregon. Other trees in the area included Douglas fir ("Pseudotsuga menziesii"), Oregon maple ("Acer macrophyllum"), and red alder ("Alnus rubra").