See:
Spruce (Picea spp.) - Schweinitzii root and butt rot
Fir, Douglas and True - Stem Decays (Heart Rots)
Note Although not common, several heart rots have been reported including: Brown Crumby Rot - Fomitopsis pinicola; Brown Cubical Rot - Laetiporus sulphurascens (the sufur fungus); Brown Top Rot - Fomitopsis cajanderi; Brown Trunk Rot - Fomitopsis officinalis; Ganoderma Trunk Rot - Ganoderma tsugae; Red Ring Rot (sometimes called white speck) - Porodaedalea pini (formerly Phellinus pini); Schweinitzii root and butt rot - Phaeolus schweinitzii (sometimes called the cow pie fungus) and Yellow Pitted Rot - Hericium abietis. Schweinitzii root and butt rot is the most important decay in old-growth Sitka spruce.
Reference Goheen, E.M., and Willhite, E.A. 2006. Field guide to the common diseases and insect pests of Oregon and Washington conifers. R6-NR-FID-PR-01-06. Portland, OR. USDA Forest Service, PNW Region.