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Grifola frondosa

Maitake
Eikhaas.JPG
Scientific classification
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Polyporales
Family: Meripilaceae
Genus: Grifola
Species: G. frondosa
Binomial name
Grifola frondosa
(Dicks.) Gray (1821)
Synonyms
  • Boletus frondosus Dicks. (1785)
  • Polyporus frondosus Fr.
Grifola frondosa
Mycological characteristics
pores on hymenium

cap is offset

or indistinct
hymenium is decurrent
lacks a stipe
spore print is white
ecology is parasitic
edibility: choice

Grifola frondosa is a polypore mushroom that grows in clusters at the base of trees, particularly oaks. The mushroom is commonly known among English speakers as hen of the woods, hen-of-the-woods, ram's head and sheep's head. It is typically found in late summer to early autumn. In the United States' supplement market, as well as in Asian grocery stores, the mushroom is known by its Japanese name maitake (舞茸, "dancing mushroom"). Throughout Italian American communities in the northeastern United States, it is commonly known as the signorina mushroom. G. frondosa should not be confused with Laetiporus sulphureus, another edible bracket fungus that is commonly called chicken of the woods or "sulphur shelf". Like all polypores, the fungus becomes inedible when older, because it is then too tough to eat.

The fungus is native to the northeastern part of Japan and North America, and is prized in traditional Chinese and Japanese herbology as a medicinal mushroom. It is widely eaten in Japan, and its popularity in western cuisine is growing, although the mushroom has been reported to cause allergic reactions in rare cases.

cap is offset

Like the sulphur shelf mushroom, G. frondosa is a perennial fungus that often grows in the same place for a number of years in succession. It occurs most prolifically in the northeastern regions of the United States, but has been found as far west as Idaho.


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Wikipedia

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