Hericium Americanum: The Bear’s Head Tooth Fungus

Bear’s-head is part of a group of closely-related tooth fungi (that is, they release their spores from tooth-like or hair-like structures, rather than from gills) that have rather confusing names[i]. To begin with,  they are sometimes all referred to as lion’s mane (a name that more properly refers to H. erinaceus only). Other writers simply refer to Hericium, without specifying which Hericium is meant.

Adding to the confusion is the fact that while Hericium americanum is the currently-accepted scientific name of the bear’s-head tooth, many people still know it by its former name, Hericium coralloides, a name now assigned to a different species, which used to be called Hericium ramosum.

Not surprisingly, some writers take the confusion one step more and refer to a mushroom as “H. americanum or H. ramosum.” What species they mean is not clear[ii].

But just as a rose by any other name would smell as sweet, this mushroom by whatever name is edible and at least reportedly has medicinal value.

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Hericium Americanum Identification and Description

Cap: Multiple caps branch from a common stem, all of them entirely covered with long, soft, hair-like or noodle-like spines. The surface is white when young, yellowing with age. The interior flesh is white and does not change when cut.
No gills. Instead, the spores are borne on soft spines all over the outer surface of the caps. These spines are much longer than in most other Hericium species.
Branched, except when very immature, and difficult to see because of the spines.
May smell fishy.
Nothing useful for ID.
Elliptical and smooth.
Spore color:
Edible and, for some, choice.
Eats dead or sometimes living wood, usually of hardwood species, in eastern North America.

An important characteristic of bear’s head is that the fruiting body is branched. Unfortunately, the long spines make the branching less than obvious. It usually grows on dead wood, but sometimes establishes in and fruits from wounds in living trees.

There are many species that bear their spores on “teeth” or soft spines, but most are unrelated. Spines have developed in fungi many times completely independently.

Hericium Americanum Look-Alikes

Hericiums don’t look like anything else (other groups of tooth fungi have very different structures), but they do look like each other, especially when young. Field identification generally depends on branching structure and spine length, but very young specimens might lack branches and have underdeveloped spines. Fortunately for foragers, all the Hericiums are edible and reportedly taste similar.

Two Hericiums are most frequently mixed up with H. americanum[iii]:

  1. erinaceum, or lion’s mane, does not branch even in maturity. Its spines are long, though not quite as long as those of bear’s head.
  2. coralloides, or comb tooth or coral tooth, has a very similar branching structure, but its spines remain very short. It does indeed resemble a branched hard coral, or possibly a small tree branch feathered with hoarfrost.

Hericium Americanum Benefits

The most well-established benefit of H. americanum is that it tastes good. Like other members of its genus, it’s taste is somewhat reminiscent of fish or shellfish, and it can be used to make “crab” cakes and soups, as well as being pan-fried. The long, soft, spines do not give the mushroom a hairy or strange texture. It is possible to buy these mushrooms, so foraging is not the only way to taste them, although some people claim that cultivated examples have less flavor.

There has been very little research into any medicinal potential of this species. Its relative, H. erinaceus, has been extensively researched, and shows real promise as a treatment for maladies as varied as Alzheimer’s disease, cognitive performance, digestive problems, and cancers[iv]. Alternative health practitioners often treat all Hericiums as interchangeable, but while it’s likely these species are biochemically similar and share benefits, there is no guarantee they are identical.

Hericium Americanum Dosage

The medical use of this species has not been established, so the proper dosages, if any, aren’t known either.

Hericium Americanum Toxicity, Safety & Side Effects

  1. americanum is not toxic, nor does it closely resemble any toxic species, although hypersensitivities and allergies are possible, as with any food. Any side effects from medicinal use are not known, though the closely-related H. erinaceus does sometimes cause mild stomach problems when used as medicine, and there has been some suggestion that it could slow clotting or lower blood sugar—advantages in some circumstances but a problem in others[v]. Long-term use has not been studied for safety at all, but the species seems to be generally safe.

One caveat is that persons wishing to experiment with H. americanum, bear’s head, for medicinal uses should remember it might well have different, or lesser, effects than its better-studied relative.


[i]       Kuo, M. (2003). Hericium americanum. MushroomExpert

[ii]      Hericium americanum or ramosum. Moral Mushroom Hunting.

[iii]     Rockland-Miller, A. (2010).  Lion’s Mane: A Foolproof Fungus. The Mushroom Forager

[iv]     Jiang, S., Wang, S., Sun, Y., Zhang, Q. (2014). Medicinal Properties of Hericium erinaceus and Its Potential to Formulate Novel Mushroom-Based Pharmaceuticals. Applied Microbiology and Biotechnology 98(18): 7661-70.

[v]      Hericeum erinaceus. WebMD


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