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Amanita muscaria

Amanita muscaria

A. muscaria
showing various growth stages.
Conservation status
Scientific classification
Kingdom: Fungi
Division: Basidiomycota
Class: Homobasidiomycetes
Subclass: Hymenomycetes
Order: Agaricales
Family: Amanitaceae
Genus: Amanita
Species: A. muscaria
Binomial name
Amanita muscaria
(L.:Fr.) Hook.
Amanita muscaria
mycological characteristics:
gills on hymenium

cap is flat or convex


hymenium is free


stipe has a ring and volva


spore print is white


ecology is mycorrhizal


edibility: poisonous or psychoactive

Amanita muscaria, commonly known as the fly agaric or fly Amanita, is a poisonous and psychoactive basidiomycete fungus, one of many in the genus Amanita. Native throughout the temperate and boreal regions of the Northern Hemisphere, Amanita muscaria has been unintentionally conveyed to many countries in the Southern Hemisphere, generally as a symbiont with pine plantations, and is now a true cosmopolitan species. It associates with various deciduous and coniferous trees. The quintessential toadstool, it is a large imposing white-gilled, white-spotted, usually deep red mushroom, one of the most recognizable and widely encountered in popular culture. Though it is generally considered poisonous, Amanita muscaria is otherwise famed for its hallucinogenic properties with its main psychoactive constituent being the compound muscimol. The mushroom has had a religious significance in Siberian culture and possibly also in ancient Indian and Scandinavian cultures.

The common names in English, fly agaric or fly mushroom, are generally thought to derive from its European use as an insecticide, sprinkled in milk.[1] This interpretation is supported by the mushroom's names in a number of other languages (see below), e.g. French Amanite tue-mouches, i.e. "fly-killer amanita". The fly-killing agent is now known to be ibotenic acid.[2] Another compound isolated from the fungus is 1,3-diolein which is an insect attractor.[3] [4] An alternate derivation proposes that the term fly- refers not to insects as such but rather the delirium resulting from consumption of the fungus. This is based on the medieval belief that flies could enter a person's head and cause mental illness.[5]


Taxonomy and naming

Similar to its English common name, the German, Fliegenpilz, Dutch Vliegenzwam, Swedish Röd flugsvamp, Danish Rød fluesvamp, Finnish punakärpässieni, Polish muchomór, Slovak muchotrávka and French Amanite tue-mouches, are derived from this property. The various common names come from its European use as an insecticide, sprinkled in milk. Fly agaric is still used in this manner in parts of eastern Europe such as Poland and Romania. This practice was first recorded by Albertus Magnus in his work De vegetabilibus sometime before 1256, commenting:

vocatur fungus muscarum, eo quod in lacte pulverizatus interficit muscas
("It is called the mushroom of flies, because crushed in milk it kills flies")[6]

This was known to Linnaeus who officially described it in Volume Two of his Species Plantarum in 1753, giving it the name Agaricus muscarius,[7] the specific epithet deriving from Latin musca meaning "fly".[8] It gained its current name in 1783, when placed in the genus Amanita by Jean-Baptiste Lamarck and sanctioned by Elias Magnus Fries.

In England and Sweden it was also used for getting rid of bugs, and bug agaric was an old alternate name.[6]

Amanita muscaria is the type species of the genus Amanita. By extension, it is also the type species of Amanita subgenus Amanita, as well as section Amanita within this subgenus. Amanita subgenus Amanita includes all Amanita with inamyloid spores. Amanita section Amanita includes those species with patchy universal veil remnants, including a volva that is reduced to a series of concentric rings and the veil remnants on the pileus being a series of patches or warts. Most species in this group also have a bulbous base.[9] [10]


Amanita section Amanita consists of A. muscaria and its close relatives, including A. pantherina (the panther agaric), Amanita gemmata, A. farinosa, and A. xanthocephala.[11] Modern fungal taxonomists have classified Amanita muscaria and its allies this way based on gross morphology and spore inamyloidy. Two recent molecular phylogenetic studies have confirmed this classification as natural.[12] [13]

  Amanita muscaria has considerable morphological variation and many authorities recognize a number of subspecies or varieties within the species. In The Agaricales in Modern Taxonomy, Rolf Singer listed three subspecies, though without description: A. muscaria ssp. muscaria, A. muscaria ssp. americana, and A. muscaria ssp. flavivolvata.[9]

Contemporary authorities recognize up to seven varieties:

  • var. muscaria, the typical red-and-white spotted variety. Some authorities, such as Rodham Tulloss, only use this name for Eurasian and western Alaskan populations.[10] [14]
  • var. flavivolvata is red, with yellow to yellowish-white warts, and occurs in the western regions of the North American continent, from southern Alaska down through the Rocky Mountains, through Central America, to at least Andean Colombia. Rodham Tulloss uses this name to describe all "typical" A. muscaria from indigenous New World populations from Alaska southward.[10] [15]
  • var. alba, an uncommon fungus, has a white to silvery white cap with white warts but otherwise similar to the usual form.[10] [16]
  • var. formosa, has a yellow to orange-yellow cap with yellowish or tan warts and stem. Some authorities use this name for all A. muscaria fitting this description worldwide (cf, Jenkins), others (cf, Tulloss) restrict its use to Eurasian populations.[10] [17]
  • var. guessowii is yellow to orange, with center of cap more orange or reddish orange than the outer part. It is found throughout North America, but is most common in northeastern North America, from Newfoundland and Quebec down to Tennessee. Some authorities (cf, Jenkins) treat these populations as part of A. muscaria var. formosa, while others (cf, Tulloss) recognize it as a distinct variety.[10] [17]
  • var. persicina is pinkish to orangish "melon" colored with poorly formed or absent remnants of universal veil on the stem and vasal bulb, known from the Southeastern Coastal areas of the U.S.A, described in 1977.[10] [18]
  • var. regalis (= Amanita regalis (Fr.) Michael), from Scandinavia and Alaska,[19] is liver-brown and has yellow warts. It appears to be uniformly distinctive and some authorities (cf, Tulloss) treat it as a separate species, while others (cf, Jenkins) treat it as a variety of A. muscaria.[10] [20]

A 2006 molecular phylogenetic study of different regional populations of A. muscaria by Geml, et al. found three distinct clades within this species representing, roughly, Eurasian, Eurasian "subalpine", and North American populations. (Alaska contains examples of all three clades, leading to the hypothesis that this was the center of diversification of this species.) The study also looked at four named varieties of this species; var. alba, var. flavivolvata, var. formosa (including var. guessowii), and var. regalis from both areas. All four varieties were found within both the Eurasian and North American clades, evidence that these morphological forms are simply polymorphisms found throughout the species rather than distinct subspecies or varieties.[21]


  A large conspicuous mushroom, Amanita muscaria is generally common and numerous where it grows, often being found in groups with basidiocarps in all stages of development. Fully grown, the bright red cap is usually around 8-20 cm (3-8 inches) in diameter, though larger specimens have been found. The red colour may fade after rain and in older mushrooms. After emerging from the ground, the cap is covered with numerous small white to yellow flecks (warts) which are remnants of the universal veil, a membrane that encloses the entire mushroom when it is still very young. The gills are white, as is the spore print. The stem is white, 5-20 cm high (approximately 2-8 inches), with a basal bulb that bears universal veil remnants (more or less distinct rings or ruffs), and has the slightly brittle, fibrous texture typical of many large mushrooms. Between the basal universal veil remnants and gills are remnants of the partial veil (which covers the gills during development) in the form of a white ring (annulus). It can be quite wide and flaccid in age. There is generally no associated smell other than a mild earthiness.[22]

Fly agaric fruiting bodies emerge from the soil looking like a white egg, covered in the white warty material of the universal veil. As the fungus grows, the red colour appears through the broken veil, and the cap changes from hemispherical to plate-like and flat in mature specimens.[23]   Though very distinctive, the fly agaric has been mistaken for other yellow to red species in the Americas such as Armillaria cf. mellea and the edible Amanita basii, a Mexican species similar to A. caesarea of Europe. Poison control centers in the U.S. and Canada are aware that "amarillo" is a common name of caesarea-like species in Mexico, not just the Spanish for 'yellow'.

Amanita caesarea can be distinguished as it has an entire orange red cap, lacking the numerous white warty spots of the fly agaric. Furthermore the stem, gills and ring are bright yellow, not white.[24] Finally the volva is a distinct white bag, not broken into scales.[25]

In Australia, the introduced fly agaric may be confused with the local Amanita xanthocephala, which grows in association with Eucalypts. This species also generally lacks the white warts of A. muscaria and bears no ring.

Distribution and habitat

  A. muscaria is a cosmopolitan mushroom, native to birch, pine, spruce, fir and cedar woodlands throughout the temperate and boreal regions of the Northern Hemisphere,[21] including high elevations of warmer latitudes in regions like the Hindu Kush, the Mediterranean and Central America. Interestingly, a recent molecular study proposes an ancestral origin in the Siberian–Beringian region in the Tertiary period before radiating outwards across Asia, Europe and North America.[21] Though generally encountered in autumn, the season can vary in different climates: fruiting occurs in summer and autumn across most of North America, but later in autumn and early winter on the Pacific coast. It is often found in similar locations to Boletus edulis.[3] It has been widely transported into the southern hemisphere, including Australia,[26] New Zealand, South Africa[27] and South America, where it usually occurs under introduced pine trees.

The fungal equivalent of a weed in southeastern Australia, it appears to have formed new associations with southern beech (Nothofagus) in Tasmania and Victoria and invading native rain forest, where there are concerns it may be displacing native species.[28] Furthermore it appears to be spreading northwards with recent reports near Port Macquarie on the New South Wales north coast.[29]

When imported to a new country, A. muscaria can jump to native species (for example, Eucalyptus in Australia). It can then be exported with its new symbiont (for example, from Australia to Argentina).


Amanita muscaria contains a number of biologically active agents, at least two of which are known to be psychoactive. Muscimol (3hydroxy-5-aminomethy-1 isoxazole, an unsaturated cyclic hydroxamic acid) is the most significant. It is the product of the decarboxylation or drying of ibotenic acid, another important compound in the biochemistry of the fly agaric. Muscarine, discovered in 1869,[30] was long thought to be the active hallucinogenic agent in A. muscaria until the mid 20th century,[31] [32] when researchers in England,[33] Japan,[34] and Switzerland[35] recognized that these effects were due mainly to ibotenic acid and muscimol.[3]

Ibotenic acid and muscimol are structurally related to two major neurotransmitters of the central nervous system: glutamic acid and GABA respectively. Ibotenic acid and muscimol act like these neurotransmitters (muscimol is a potent GABAA agonist) which are involved in the control of neuronal activity. It is these interactions which are thought to cause the brain dysfunction found in intoxication. Following ingestion some of the ibotenic acid is decarboxylated to muscimol which would appear to be the agent responsible for the majority of the psychoactivity.[5][36] When muscimol is administered, it has been shown active in the cerebral cortex, hippocampus, and cerebellum.[citation needed]

Muscazone is another compound more recently isolated from European specimens of the fly agaric. It is a product of the breakdown of ibotenic acid by ultra-violet radiation.[37] It is of minor pharmacological activity compared with the other agents.[5]

Muscarine binds with Muscarinic acetylcholine receptor and lead to the excitation of the neurons bearing these receptors. The levels in Amanita muscaria are minute when compared with other poisonous fungi,[38] such as the deadly Inocybe patouillardii or small white Clitocybe species C. dealbata and C. rivulosa.



Victims of Amanita muscaria poisoning are generally either young children or people ingesting it for a hallucinogenic experience.[3] About one gram of A. muscaria or 50-100 mg ibotenic acid is considered a toxic dose.[39] [40] Ibotenic acid, a compound present in A. muscaria, is a powerful neurotoxin that is used as a "brain-lesioning agent" and has shown to be highly neurotoxic when "injected directly into the brains of mice and rats."[41]

Fly agarics are known for the unpredictability of their effects. Depending on habitat and the amount ingested per body weight, effects can range from nausea and twitching to drowsiness, cholinergic effects (low blood pressure, sweating and salivation), auditory and visual distortions, mood changes, euphoria, relaxation, and loss of equilibrium. Retrograde amnesia frequently results following recovery.[42] [43] [36]

In cases of serious poisoning it causes a delirium, characterized by bouts of marked agitation with confusion, hallucinations, and irritability followed by periods of central nervous system depression. Seizures and coma may also occur in severe poisonings.[36] Effects typically appear after around 30 to 90 minutes and peak within three hours, but certain effects can last for a number of days. [39][44] In the majority of cases recovery is complete within 12 hours. The effect is highly variable and individuals can react quite differently to the similar doses.[42][39] [45]

Deaths from A. muscaria are extremely rare. A historical journal article reported 2 fatalities occurring in North America. [46] With modern medical treatment the prognosis is generally good.[47]

The amount and ratio of chemical compounds per mushroom varies widely from region to region, season to season, further confusing the issue. It has been reported that spring and summer mushrooms may contain up to 10 times as much ibotenic/muscimol as compared to fall fruitings.[42] Many older books list it as deadly, giving the impression that it is far more toxic than it really is. The vast majority of mushroom poisoning fatalities (90% or more) are from having eaten either the greenish to yellowish to brownish mottled death cap (A. phalloides) or one of the destroying angels (Amanita virosa).

The toxic substances of A. muscaria are water soluble and susceptible to heat. The mushroom can be at least partly detoxified by thoroughly parboiling or leaching it in boiling water because it is said[weasel words]that the ibotenic acid turns into muscimol under this heat. This supposedly[weasel words] removes several unpleasant side effects due to the conversion of the much more toxic ibotenic acid into muscimol. According to some sources, once detoxified, the mushroom becomes edible.[48] In Sanada, Japan fly agarics are detoxified by pickling them. [49]

Psychoactive properties

  In contrast to hallucinogenic mushrooms of the Psilocybe, Amanita muscaria is rarely consumed recreationally.[50] It is unscheduled in the United States. Any sales of A. muscaria for human ingestion are regulated by the FDA. Most other countries do not have laws against the use of A. muscaria, as it is currently legal and un-controlled under UN international law. However, following the outlawing of psilocybin containing mushrooms in the UK, an increased quantity of Amanita mushrooms began to be sold and consumed.[51]

The active ingredient is excreted in the urine of those consuming the mushrooms, and it has sometimes been the practice for a shaman to consume the mushrooms, and the rest of the tribe to drink his urine: the shaman, in effect, partially detoxifying the drug (the sweat- and twitch-causing muscarine is absent in the urine).[52] This was also not an uncommon practice in Siberia, where the poor would consume the urine of the wealthy, who could afford to buy the mushrooms.[52] If a fly agaric is eaten, it is usually not fresh, but in its dried or cooked form, where ibotenic acid is converted to the more stable and far less poisonous muscimol.

Cultural history

  A. muscaria was widely used as a hallucinogenic drug by many of the peoples of Siberia. Its use was known among almost all of the Uralic-speaking peoples of western Siberia and the Paleosiberian-speaking peoples of eastern Siberia. However, there are only isolated reports of A. muscaria use among the Tungusic and Turkic peoples of central Siberia and it is believed that hallucinogenic use of A. muscaria was largely not a practice of these peoples.[53] [52] In western Siberia, the use of A. muscaria was restricted to shamans, who used it as an alternate method of achieving a trance state. (Normally, Siberian shamans achieve a trance state by prolonged drumming and dancing.) In eastern Siberia, A. muscaria was used by both shamans and laypeople alike, and was used recreationally as well as religiously.[53]

The Koryak of eastern Siberia have a story about the fly agaric (wapaq) which enabled Big Raven to carry a whale to its home. In the story, the deity Vahiyinin ("Existence") spat onto earth, and his spittle became the wapaq, and his saliva becomes the warts. After experiencing the power of the wapaq, Raven was so exhilarated that he told it to grow forever on earth so his children, the people, can learn from it.[6]

Beyond Siberia, there are only isolated and unconfirmed reports of the hallucinogenic use of A. muscaria. One source mentions that it was once used among the Sami people, but no firsthand accounts of this exist.[52] Hartmut Geerken claims to have discovered a tradition of recreational use of this mushroom among a Parachi-speaking group in Afghanistan.[54] There are also unconfirmed reports of religious use of A. muscaria among two Subarctic Native American tribes, the Ojibway[55] [56] and the Dogrib.[57]

There are also claims that A. muscaria played in important role in a number of ancient religious rites, though these claims tend to be speculative and highly controversial. The best known of these claims is R. Gordon Wasson's proposition that A. muscaria was the Soma talked about in Rig Veda of India,[52] and is less often also thought to be the amrita talked about in Buddhist scriptures.[58] (For more details on this topic, see Botanical identity of Soma-Haoma.)

The British writer Robert Graves theorizes in a preface to his book, The Greek Myths, that the Dionysian rites were conducted under the influence of this mushroom.[59] John Marco Allegro argues in The Sacred Mushroom and the Cross that the Christian religion is derived from a sex and psychedelic mushroom cult,[60], although his theory has found little support by scholars outside the field of ethnomycology. In Magic Mushrooms in Religion and Alchemy (formerly called Strange Fruit) Clark Heinrich interprets A. muscaria usage by Adam and Eve, Moses, Elijah and Elisha, Isiah, Ezekiel, Jonah, Jesus and his disciples, and John of Patmos.[61] In the book Apples of Apollo the mushroom is identified in a wide range of mythological tales such as those involving Perseus, Prometheus, Heracles, Jason and the Argonauts, Jesus and the Holy Grail.[62]

The notion that Nordic Vikings used A. muscaria to produce their berserker rages was first suggested by the Swedish professor Samuel Ödman in 1784.[63] Ödman based his theories on reports about the use of fly agaric among Siberian shamans. The notion has become widespread since the 19th century, but no contemporary sources mention this use or anything similar in their description of berserkers. Today, it is generally considered an urban legend or at best speculation that cannot be proven. On the whole, Muscimol, the psychoactive ingredient, is a mild relaxant, but it is widely known, as with all drugs that it can create a range of reactions within a range of people [64] and it is possible that it could make a person incredibly angry, as well as make them "very jolly or sad, [jump] about, [dance], [sing] or [give] way to great fright". [65]

Ethnobotanist and ethnomycologist Giorgio Samorini suggests in his book "Animals and Psychedelics" a symbiotic relationship between toads, flies and fly agaric. Flies, after a lick of A. muscaria become inebriated and delirious prey for hungry toads that may have learned this, therefore hanging out around toadstools. This relationship within nature illuminates an etymological keystone and example of zoopharmacognosy. This would also provide further biosemiotic insight into the ancient mystery of toads, flies and mushrooms appearing together in popular mythology and fairy lore. However it is more commonly thought that toads are associated with the mushroom because they symbolise toxicity and chthonic forces in the same way that serpents do.

Authors of Sacred Soma Shamans Hawk and Venus have used A. muscaria as a sacrament and daily medicinal tonic since 1979.[66] North American shamans claim that proper handling and use results in higher levels of consciousness.

In popular culture


The red-and-white spotted toadstool is a common image in many aspects of popular culture, especially in children's books, film and more recently computer games; a partly grown A. muscaria, as shown right, is clearly the fungus which this icon is based on.


Images dating back to 3500BC painted in caves at Tassili, Algeria, depict mushrooms, more than likely including A. muscaria mushrooms according to scholars [1], although a Psilocybe species has also been suggested.

Fly agarics have been featured in paintings since the Renaissance [2], albeit in a subtle manner. In the Victorian era they became more visible, even becoming the main topic of some fairy paintings [3], usually inspired by Shakespeare's A Midsummer Night's Dream. The waning of Romanticism and the advent of World War I reduced interest in fairies along with fly agarics, reducing them to the realm of childish fantasies.

Literature and Entertainment

Garden ornaments, and children's picture books depicting gnomes and fairies, such as the Smurfs, very often show fly agarics used as seats, or homes; it is rather uncommon for any other identifiable mushroom to be shown in this role. Two of the most famous uses of the mushroom are in the video game series Super Mario Bros. and the dancing mushroom sequence in the 1940 Disney film Fantasia.[6]

Christmas decorations and Santa Claus


Fly agarics appear on Christmas cards and New Year cards [4] from around the world as a symbol of good luck. They also function as Christmas tree decorations [5], derived from their ectomycorrhizal relationship with coniferous trees. The ethnobotanist Jonathan Ott has suggested that the idea of Santa Claus and tradition of hanging stockings over the fireplace is based centrally upon the fly agaric mushroom itself.[45] With its generally red and white color scheme, he argues that Santa Claus's suit is related to the mushroom. He also draws parallels with flying reindeer: reindeer are said to enjoy the mushroom because of its euphoric results, and therefore prance around in a hallucinogenic after-effect.[citation needed] It is true that reindeer will eat fly agarics, but there is no proof that it has any kind of mental effects on them.[citation needed] Until the 20th century the red-and-white Santa suit familiar today was not firmly established, although Saint Nicholas, on which Santa Claus is partly based, was always depicted in red (see also: Origins of Santa Claus). One scholar researching possible links between religious myths and the red mushroom notes, "If Santa Claus had but one eye [like Odin], or if magic urine had been a part of his legend, his connection to the Amanita muscaria would be much easier to believe."[58]

Ott also speculates about Santa's bag of toys. According to historians, ancient Siberia was one of the first civilizations to use fly agaric in practice.[citation needed] The Siberian hut, or yurt, is equipped with a smokehole at the top. Ott suggests that a shaman entered the yurt through the smokehole with a sack of mushrooms in his hand, to be placed in stockings over the fireplace where they could be dried for celebratory use.


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Further reading

  • Högberg O. Flugsvampen och människan. (In Swedish) ISBN 91-7203-555-2
    • Chapter 2
  • Michelot D, Melendez-Howell LM. (2003) Amanita muscaria: chemistry, biology, toxicology, and ethnomycology. Mycological Research 107:131–146. doi:10.1017/S0953756203007305
  • Schultes RE, Hofmann A, Rätsch C. (2001). Plants of the gods: their sacred, healing, and hallucinogenic powers (2nd ed). ISBN 0892819790
  • Peter Lamborn Wilson. "Ploughing the Clouds: The Search for Irish Soma"[6]
  • Hawk and Venus. Sacred Soma Shamans[7]
be-x-old:Чырвоны мухамор
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Amanita_muscaria". A list of authors is available in Wikipedia.
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