
Bear's Head Tooth
Hericium americanum
Coarser branches with longer spines, up to 1.5 inches, hanging in tufts rather than in even rows.
Hericium coralloides
Also called comb tooth, coral hedgehog.
The coral tooth is a white, delicately branched fungus with short spines hanging in rows along its branches. It grows on dead hardwood logs and stumps in late summer and fall and is the most finely branched of the North American Hericium species.

The tell
White, finely branched fungus with short spines in rows along the branches, like icicles.
Field marks
Cap, underside and stem show in a photo. The spore print does not, and it is often the deciding check.
Where and when
Lookalikes
Each card says how to tell the two apart.

Hericium americanum
Coarser branches with longer spines, up to 1.5 inches, hanging in tufts rather than in even rows.

Hericium erinaceus
A single unbranched clump of long spines.

Artomyces pyxidatus
A coral fungus whose branches point upward and end in tiny crown-like tips, with no hanging spines.
Edibility
Field guides list the coral tooth as edible when young and white. Like other Hericium species, it becomes tougher and yellowish with age, and guides record no toxic species with the same spined, branched form.
This page states what field guides record. It is not advice to eat, taste or handle anything, and a photo cannot settle edibility. If someone has eaten a wild mushroom that may be toxic, call poison control (1-800-222-1222 in the US) right away, before symptoms start: the deadliest species act hours later.
FAQ
Field guides list Hericium coralloides as edible when young and white. It is less fleshy than lion's mane because of its fine branches and short spines.
A white, delicately branched mass like a piece of coral, with short spines hanging in neat rows along the branches like icicles or the teeth of a comb. It grows from the side of dead hardwood logs and stumps.
Coral tooth has finer branches and short spines, usually under half an inch, in rows along the branches. Bear's head tooth has longer spines hanging in tufts from the branch tips.
Sources
MushroomExpert.com
Fungi Growing on Wood, Gary Emberger (MushroomExpert.com)
Missouri Department of Conservation
Index Fungorum
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