Irpex lacteus is in the phylum Basidiomycota, class Hymenomycetes, order Aphyllorphorales, family Polyporaceae and genus Irpex. Common name is “Milk-white Toothed Polypore.” Fruiting body is effused-reflexed growing on the underside of fallen hardwoods. Fruiting body appears to be similar in color to milk, but may range from white, to off-white or cream colored. Pores that break up into short teeth (less than 3 mm long) when mature. Fruiting body is dry and stiff (Bessette et al.).
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Picture of Irpex lacteus from messiah.edu
Photo by William Tannenberger