Hericium americanum

What it is

Hericium americanum is a white fungus of the order Russulales. It forms branched fruit bodies with long, pendent, tooth-like spines, and grows from dead or wounded hardwoods and logs. Its appearance overlaps with other white tooth fungi, including H. coralloides and H. erinaceus, so the name rests on DNA-supported separation rather than shape alone.

Ginns proposed the name in 1984, separating an eastern North American entity from H. coralloides as it was then used in North America. A 2025 multilocus phylogeny by Koga, Thorn and Langer resolved it as a distinct, strongly supported group with an eastern North American range. The same paper warns that Hericium specimens and database sequences are often misidentified.

Food use and cautions

Iowa State University Extension groups H. americanum with H. coralloides and H. erinaceus and calls the group edible when young and highly regarded by collectors. It warns that older fruit bodies become brownish and bitter. An Ohio field guide gives a species-specific account: young specimens can be cooked and eaten, and it lists August to October as the timing.

The culinary statements here cover young, correctly identified fruit bodies that are cooked. No medicinal or supplement claim is supported by these sources. Photographs labelled on community sites are not automatically DNA-confirmed, and a specimen should not be eaten on the strength of a photograph or a single feature.

Habitat and season

The species fruits on dead or wounded hardwoods and logs. The Iowa season, late summer or fall, applies to the grouped species. The Ohio timing chart gives August to October for the species alone. Both are regional guides and are not a universal calendar.