Grifola frondosa

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, 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"). It is native to China, Europe, and North America.[2]

Grifola frondosa
float Mycological characteristics
	pores on hymenium
	cap is offset or indistinct
	hymenium is decurrent
	lacks a stipe
	spore print is white
	ecology is parasitic
	edibility: edible

"Ram's Head" redirects here. For locations with that name, see Ram Head. For the military skill badge, see Ram's Head Device. For the head of the male animal, see sheep.

Maitake
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.[1]

Description

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.

G. frondosa grows from an underground tuber-like structure known as a sclerotium, about the size of a potato. The fruiting body, occurring as large as 100 centimetres (40 inches), rarely 150 cm (60 in), is a cluster consisting of multiple grayish-brown caps which are often curled or spoon-shaped, with wavy margins and 2–10 cm (1–4 in) broad.[3] The undersurface of each cap bears about one to three pores per millimeter, with the tubes rarely deeper than 3 mm (¹⁄₈ in).[3] The milky-white stipe (stalk) has a branchy structure and becomes tough as the mushroom matures.

In Japan, the maitake can grow to more than 45 kilograms (100 pounds), earning this giant mushroom the title "king of mushrooms".

Identification

Some similar-looking species are toxic. Edible species which look similar to Grifola frondosa include Meripilus sumstinei (which stains black), Sparassis spathulata[4] and Laetiporus sulphureus, another edible bracket fungus that is commonly called chicken of the woods or "sulphur shelf".

Uses

Maitake has been consumed for centuries in China and Japan[5] where it is one of the major culinary mushrooms. The mushroom is used in many Japanese dishes, such as nabemono. The softer caps must be thoroughly cooked.[3]

Research

Although under laboratory and preliminary clinical research for many years, particularly for the possible biological effects of its polysaccharides, there are no completed, high-quality clinical studies for Grifola frondosa as of 2019.[5][6]

References

1. McIlvaine, Charles; Robert K. Macadam; and Robert L. Shaffer. 1973. One Thousand American Fungi. Dover Publications. New York. 729 pp. (Polyporus frondosus, pp. 482-483 & Plate CXXVIII.)
2. Meuninck, Jim (2015-06-01). Jim Meuninck - Basic Illustrated Edible and Medicinal Mushrooms, pp. 13-14, Rowman & Littlefield, 1 Jun 2015. ISBN 9781493014682. Retrieved 27 April 2017.
3. Phillips, Roger (2010). Mushrooms and Other Fungi of North America. Buffalo, NY: Firefly Books. p. 300. ISBN 978-1-55407-651-2.
4. Meuninck, Jim (2017). Foraging Mushrooms Oregon: Finding, Identifying, and Preparing Edible Wild Mushrooms. Falcon Guides. p. 114. ISBN 978-1-4930-2669-2.
5. "Maitake, Grifola frondosa". Drugs.com. 2 September 2019. Retrieved 19 December 2019.
6. "Maitake". Memorial Sloan Kettering Cancer Center. 2019. Retrieved 19 December 2019.