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type of basidium fungus characterized by spore-bearing gills on the underside of the umbrella- or cone-shaped cap. The name toadstool is popularly reserved for inedible or poisonous mushrooms, but this classification has no scientific basis. The only safe way of distinguishing between the edible and the poisonous species is to learn to identify them. Some poisonous mushrooms are of the genus Amanita. The genus includes the fly agaric, Amanita muscaria, and the death angel or destroying angel, A. virosa.

The use of edible mushrooms for food dates back at least to early Roman times. Originally a delicacy for the elite, mushrooms are now extensively grown on a commercial scale, especially the cultivated mushroom or champignon, Agaricus bisporus, and the shiitake mushroom, Lentinus edodes. Their culture requires careful control of temperature and humidity. The bulk of the crop in the United States is grown near Philadelphia. In Europe more than 50 species of mushrooms are marketed. Although mushrooms contain some protein and minerals, they are largely composed of water and hence are of limited nutritive value.

The truffletruffle
[Fr.], subterranean edible fungus that forms a mutually beneficial (symbiotic) relationship with the roots of certain trees and plants. The part of the fungus used as food is the ascoma, the fruiting body of the fungus.
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, puffballpuffball
or smokeball,
fungus in which the aboveground portion is typically a stemless brownish sac with an opening at the top through which issues the dustlike mass of ripe spores. The common puffball is Lycoperdon gemmatum. The giant puffball (L.
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, and other edible fungi are sometimes also called mushrooms. In all cases the term mushroom is properly restricted to the above-ground portion, which is the reproductive organ. Mushrooms are classified in the kingdom FungiFungi
, kingdom of heterotrophic single-celled, multinucleated, or multicellular organisms, including yeasts, molds, and mushrooms. The organisms live as parasites, symbionts, or saprobes (see saprophyte).
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, phylum (division) Basidiomycota.


See A. H. Smith and N. A. Weber, The Mushroom Hunter's Field Guide (rev. ed. 1980); O. K. Miller, Jr., Mushrooms of North America (rev. ed. 1979); G. H. Lincoff, The Audubon Society Field Guide to North American Mushrooms (1981).


A macroscopic fungus with a fruiting body (also known as a sporocarp). Approximately 14% (10,000) described species of fungi are considered mushrooms. Mushrooms grow aboveground or underground. They have a fleshy or nonfleshy texture. Many are edible, and only a small percentage are poisonous.

Mushrooms reproduce via microscopic spheres (spores) that are roughly comparable to the seeds of higher plants. Spores are produced in large numbers on specialized structures in or on the fruiting body. Spores that land on a suitable medium absorb moisture, germinate, and produce hyphae that grow and absorb nutrients from the substratum. If suitable mating types are present and the mycelium (the threadlike filaments or hyphae that become interwoven) develops sufficiently to allow fruiting, the life cycle will continue. In nature, completion of the life cycle is dependent on many factors, including temperature, moisture and nutritional status of the substratum, and gas exchange capacity of the medium.

Fewer than 20 species of edible mushrooms are cultivated commercially. The most common cultivated mushroom is Agaricus bisporus, followed by the oyster mushroom (Pleurotus spp.). China is the leading mushroom-producing country; Japan leads the world in number of edible species cultivated commercially.

Mushrooms may be cultivated on a wide variety of substrates. They are grown from mycelium propagated on a base of steam-sterilized cereal grain. This grain and mycelium mixture is called spawn, which is used to seed mushroom substrata.

Mushrooms contain digestible crude protein, all essential amino acids, vitamins (especially provitamin D-2), and minerals; they are high in potassium and low in sodium, saturated fats, and calories. Although they cannot totally replace meat and other high-protein food in the diet, they can be considered an important dietary supplement and a health food.

Fungi have been used for their medicinal properties for over 2000 years. Although there remains an element of folklore in the use of mushrooms in health and medicine, several important drugs have been isolated from mushroom fruiting bodies and mycelium. The best-known drugs obtained are lentinan from L. edodes, grifolin from Grifola frondosa, and krestin from Coriolus versicolor. These compounds are protein-bound polysaccharides or long chains of glucose, found in the cell walls, and function as antitumor immunomodulatory drugs. See Fungi, Medical mycology


A fungus belonging to the basidiomycetous order Agaricales.
The fruiting body (basidiocarp) of such a fungus.


symbol of suspicion. [Plant Symbolism: Flower Symbolica, 310]


1. the fleshy spore-producing body of any of various basidiomycetous fungi, typically consisting of a cap (see pileus) at the end of a stem arising from an underground mycelium. Some species, such as the field mushroom, are edible
2. the fungus producing any of these structures
References in classic literature ?
She stretched herself up on tiptoe, and peeped over the edge of the mushroom, and her eyes immediately met those of a large caterpillar, that was sitting on the top with its arms folded, quietly smoking a long hookah, and taking not the smallest notice of her or of anything else.
said D'Artagnan, who could not understand how the bishop of Vannes, who had been so indifferent a favorite the previous evening, had become in half a dozen hours the most magnificent mushroom of fortune that had ever sprung up in a sovereign's bedroom.
Let 'em quash every pocket borough to-morrow, and bring in every mushroom town in the kingdom--they'll only increase the expense of getting into Parliament.
He sat down on a large mushroom, and now there was a quiver in his voice.
Yet, after all, when we entered the lofty iron gateway, when we drove softly up the smooth, well-rolled carriage-road, with the green lawn on each side, studded with young trees, and approached the new but stately mansion of Wellwood, rising above its mushroom poplar-groves, my heart failed me, and I wished it were a mile or two farther off.
He watched the lavish waste of the mushroom millionaires, and failed quite to understand it.
And the blind man and the dog, from midnight to dawn, successfully fought off twelve men equipped with the thunder of gunpowder and the wide-spreading, deep-penetrating, mushroom bullets of soft lead.
So Hans Nelson worked at his trade that winter and helped rear the mushroom outfitting- town of Skaguay.
It has a mucilaginous, slightly sweet taste, with a faint smell like that of a mushroom.
We would not deal with a man thus plodding ever, leaning on a hoe or a spade as a staff between his work, not as a mushroom, but partially risen out of the earth, something more than erect, like swallows alighted and walking on the ground:--
He turned up, under a load of soil, something that did not look like a potato, but rather like a monstrous, over-domed mushroom.
His halls blazed with light and magnificence; were resplendent with gilt frames (containing pictures), and dubious antiques; and the enormous gilt crown and arms of the princely owner, a gold mushroom on a crimson field (the colour of the pocket-handkerchiefs which he sold), and the silver fountain of the Pompili family shone all over the roof, doors, and panels of the house, and over the grand velvet baldaquins prepared to receive Popes and Emperors.