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Yellow Stain 

Fomitopsis officinalis
(Brown Trunk Rot)

Fomitopsis pinicola
(Brown Crumbly Rot)

Hericium abietis
(Yellow Pitted Rot)

Heterobasidion annosum
(Annosus Root and Butt Rot)

Phaeolus schweinitzii
(Schweinitzii Butt Rot)

Phellinus weirii
(Laminated Root Rot)