Appearance
The fungus grows as a thick, yellow crust on the underside of damaged apple tree branches, with dimensions of 3–20 cm wide by 5–20 cm long. The tightly-packed teeth are 5–12 mm long and have tapered tips. They are pale to bright yellow in colour, although both bruising and age tend to cause a reddish discolouration. The odour of the fungus has been described as "fruity but unpleasant".Fruit bodies of the fungus contain the benzoquinone-derived compound sarcodontic acid, which impart the yellow colour. The fungus can be used as a mushroom dye, and produces a pinkish-brown colour with a variety of mordants.
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