Phanerochaete chrysorhiza

Scientific name:  Phanerochaete chrysorhiza (Torrey)
Gilbert
Derivation of name:  Chrys- means "golden" or "gold" and
rhiz- means root." Chrysorhiza means "golden root" in
reference to the bright yellow rhizomorphs.
Synonyms:  Hydnum chryscomum; Mycoacia fragilissima;
Oxydontia fragilissima.
Common name(s):   Spreading yellow tooth.
Phylum:   Basidiomycota
Order:   Polyporales
Family:   Phanerochaetaceae
Occurrence on wood substrate: Saprobic; sheetlike and
flattened against the underside of hardwood logs; June through
January. 
Dimensions:  Fruit bodies 2-6 cm wide or much larger;
cordlike, bright orange, branching rhizomorphs may be 10-20
cm long.  
Description:  This fungus appears as a bright orange-yellow
spreading crust with a white margin and with bright orange
rhizomorphs serving as runners. Close examination reveals the
fertile surface is made up of crowded, yellow to orange
spines with rounded tips.      
Edibility: Inedible.
Comments:  Finding this colorful fungus is worth the effort of
looking at the underside of logs.

More information at TomVolkFungi.net:  


Figure 1.   This fungus was observed on the undersurface of a
log in Wisconsin. Although the spiny fertile portion was not
present, Tom Volk and I concluded that the presence of the
bright orange rhizomorphs was good evidence this specimen
is Phanerochaete chrysorhiza. Photo © Gary Emberger.


Figure 2. The rhizomorphs function to enter the wood
substrate. Photo © Gary Emberger.


Figure 3. The fertile, spine-bearing portion of
Phanerochaete chrysorhiza is to the left and the sterile
rhizomorphs are at the right. Photo © Dianna Smith.


Figure 4. Enlargement of a portion of Figure 3 showing the
rounded spines. Photo © Dianna Smith.

 

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