Irpex lacteus

Scientific name:   Irpex lacteus (Fr.) Fr.
Derivation of name:   Irpex means "a large rake with
iron teeth"; lacteus means "milky."
Synonymy:   Polyporus tulipiferae (Schw.) Overh.
Common names:   Milk-white toothed polypore.
Phylum:   Basidiomycota
Order:   Polyporales
Family:   Phanerochaetaceae
Occurrence on wood substrate: Saprobic; on dead
branches of deciduous trees; year-round.   
Dimensions:  Caps (when present) 1-4 cm wide.   
Upper surface:  Growth entirely resupinate to effused-
reflexed; caps (when present) whitish, drying yellowish;
velvety hairy.
Pore surface: White to cream, dingy yellow in age; tubes
breaking up into flattened teeth up to 6 mm long.
Edibility: Inedible.
Comments: The brackets often fuse to form long rows.
The caps may be very small in comparison to the spreading,
resupinate portions of this fungus.

More information at   

Figure 1. Irpex lacteus on a hardwood branch.
Photo © Gary Emberger.

Figure 2. Note how milk-white toothed polypore caps fuse
to form long rows, often with a substantial resupinate area.
Photo © Larry Grand.

Figure 3. Many individual effused-reflexed specimens.
Photo © William Roody.

Figure 4. The tube walls disintegrate in such a manner that
flat tooth-like portions remain to form the fertile surface.
Photo © Gary Emberger.

Figure 5. The individual teeth may be several mm in
length. Photo © Gary Emberger.


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