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Resupinate crust fungus. Fertile surface is shaggy, toothed, and white/cream/pale orange in color. Teeth are long and pointed (not blunt). Younger portions have shorter teeth that appear more pale. Irpex lacteus is a white-rot crust fungus in the Polyporales order. Depending on growth conditions, it can be labeled a polypore or a hydnoid (toothed) fungus. It is saprobic on wood.
Growing on the side/underside of a decaying log at the base of a ridge in a dense mixed hardwood/coniferous forest in Northwest Georgia (Gordon County), US.