A number of inedible or poisonous coral mushrooms are superficially similar in that they are white and have a spindly branching structure. They differ in that the spines do not hang downwards. The edible Hericium erinaceus
differs in that it does not have branches, which makes its overall form more rounded in maturity and reminiscent of a pom-pom with downward-hanging spines.
See also Hericium americanum