Phlebia tremellosa

Scientific name:   Phlebia tremellosa (Schrad.)
Nakasone & Burds.
Derivation of name:  Phlebia means "veins"; tremellosa
means "trembling."
Synonymy:   Merulius tremellosus Schrad.
Common names:   Trembling Merulius.
Phylum:   Basidiomycota
Order:   Polyporales
Family:   Meruliaceae
Occurrence on wood substrate: Saprobic; resupinate to
effused-reflexed to sessile, sometimes in overlapping
clusters, mostly on decaying deciduous wood; July through
January.   
Dimensions:  Sheetlike portions 2.5-7.5 cm wide with
projecting caps up to 2 cm long; margins often fusing
laterally to form more extensive sheetlike growths.  
Upper surface: Caps white to pale yellow; hairy, wooly.
Pore surface: Pore-like with a network of radiating folds,
ridges, and crossveins; yellowish to brownish-orange to
pinkish-orange; rubbery, flexible, and gelatinous.
Comments: The network of radiating and cross-veined
folds and ridges on the fertile surface of Phlebia species is
not a true tube layer as in the true polypores. Basidia cover
just the lining of the tubes in the true polypores but basidia
cover the entire surface of the pore-like layer in Phlebia.

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Figure 1. Wrinkled fertile surface and wooly white caps of
Phlebia tremellosa. Photo © Gary Emberger.


Figure 2. Fertile surface view of Phlebia tremellosa.
Photo © TomVolk.

Figure 3. The specimen on the right shows the white, hairy
cap. Photo © Tom Volk.

Figure 4. Specimens of Phlebia tremellosa. Photo © Larry
Grand.

Figure 5. Pore-like network of branched, cross-
veined folds and ridges. Photo © Tom Volk.

Figure 6. This young specimen growing in a forest in
Wisconsin was tentatively identified by Tom Volk to be
Phlebia tremellosa. Photo © Gary Emberger.

Figure 7. A closeup of some of the young folds/ridges
of the specimen in Figure 5. Photo © Gary Emberger.