Forest and Shade Tree Pathology

Decays on Parade

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Students of forest pathology should be able to recognize the fungi in their area (and some very important fungi from other areas) on sight and know their decay type, hosts, and other essential facts. This is a small portion of the many hundreds of important decay fungi.

Important Wood-Decay Fungi
Fungus Decay type Common name of fungus, decay, or disease Common hosts Comments
Stem-Decay Fungi
Dichomitus squalens white red rot ponderosa pine slash and heart rot, enters branch stubs. Formerly known as Polyporus ancepsFIDL icon
Echinodontium tinctorium white Indian paint fungus many non-pine conifers enters branch stubs, dead twigs
Fomitopsis officinalis brown quinine fungus    
Inonotus glomeratus white   maples, beech small clinker "conks" in stubs that won't heal
Inonotus obliquus white clinker or cinder conk birches large clinker "conks;" real conks appear after tree dies
Phellinus igniarius white false tinder fungus, white trunk rot many hardwoods very common and important
Phellinus pini white pocket red ring rot conifers branch stubs, punk knots
Phellinus tremulae white white trunk rot aspen very similar to Phellinus igniariusHow-to logoFIDL icon
Stem decays of spruce and fir in the Rocky Mountains       FIDL icon
Stem decays of red and white firs        FIDL icon
Root- and Butt-Rot Fungi
Armillaria spp. white Armillaria or shoestring root rot, honey mushroom many frequently associated with stress in hardwoodsFIDL icon
Heterobasidion annosum white annosum root rot conifers FIDL iconFIDL icon
Phaeolus schweinitzii brown velvet-top fungus, cowpie fungus conifers, especially pines causes extensive butt rot, no tree-tree growth.
Phellinus sulphurascens white   Douglas-fir and other non-cedars This used to be called P. weirii. Tends to be annual, direct mortality and uprootingFIDL icon
Phellinus weirii white laminated root rot western red cedar tends to be perennial, butt rot, snapping
Primarily Saprobic Fungi
Daedalea quercina brown Oak fungus oak beautiful sinuous pores
Fomes fomentarius white Tinder fungus hardwoods  
Fomitopsis pinicola brown Red-belt fungus conifers major brown rotter
Ganoderma applanatum white mottled Artist's conk hardwoods  
Gloeophyllum sepiarium brown   conifers usually gill-like pore surface, exposed wood in service
Trametes versicolor white Turkey-tail hardwoods common in NE
Laetiporus sulfureus brown Sulfur shelf, chicken of the woods hardwoods and conifers can cause heart rot; good edible when young

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Last modified 27 May, 2007