Ganoderma oregonense (also known as the west-coast reishi, western varnished conk, lacquer fungus, and/or American ling-chi) is a species of bracket fungus that causes root and butt white rot in conifers in northwestern coastal North America,[2][3] including California, Oregon, Washington, British Columbia, Yukon, and Alaska.

[3] Trees inoculated with G. oregonense end up with spongy, soft insides.

[8] This is unusual for a Ganoderma, specimens of which are usually far too tough to be eaten (reishi is often dried, powdered and consumed as a mushroom tea).

[8] This species was originally described by W. A. Murrill as "Pileus reniform, corky, rigid, convex above, plane below, 10 x 17 x 5 cm; surface glabrous, thinly encrusted, smooth, laccate, very lustrous, bay to black, with a deep groove near the margin, which is cream-colored, rounded, smooth, entire, finely tomentose; context punky, white to slightly discolored, homogeneous, with white lines of mycelium near the stipe, 2-3.5 cm.

long, avellaneous within, mouths circular to angular, 3 to a mm., edges thin, entire, white to avellaneous; stipe lateral, very thick, short, subcylindric, 2-4 cm long, 3-6 cm.