Amanita gemmata

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Amanita gemmata
Amanita gemmata von hms.jpg
In different stages of development
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Amanitaceae
Genus: Amanita
Species:
A. gemmata
Binomial name
Amanita gemmata
(Fr.) Bertill. (1866)
Synonyms
Species synonymy [1] [2] [3]
  • Agaricus gemmatusFr. (1838)
  • Agaricus adnatus W.G.Sm. (1870)
  • Amanita gemmata(Fr.) Gillet (1874)
  • Amanita junquilleaQuél. (1876)
  • Amanita gemmata f. amiciGillet (1884)
  • Amanita muscaria var. gemmata(Fr.) Quél. (1886)
  • Amanitopsis adnata(W.G.Sm.) Sacc. (1887)
  • Amanitopsis gemmata(Fr.) Sacc. (1887)
  • Amanita adnata(W.G.Sm.) Sacc. (1925)
  • Amanita junquillea var. exannulata J.E.Lange (1935)
  • Amanitaria gemmata(Fr.) E.-J.Gilbert (1940)
  • Venenarius gemmatus(Fr.) Murrill (1948)
Amanita gemmata
Information icon.svg
Gills icon.png Gills on hymenium
Convex cap icon.svgFlat cap icon.svg Cap is convex or flat
Adnate gills icon2.svgAdnexed gills icon2.svg Hymenium is adnate or adnexed
Ring stipe icon.svg Stipe has a ring
Transparent spore print icon.svg
Spore print is white
Mycorrhizal fungus.svgEcology is mycorrhizal
Mycomorphbox Poison.pngMycomorphbox Psychoactive.pngEdibility is poisonous or psychoactive

Amanita gemmata, commonly known as the gemmed amanita [4] or the jonquil amanita, is an agaric mushroom of the family Amanitaceae and genus Amanita . The fruit body has a cap that is a dull to golden shade of yellow, and typically 2.5–12 centimetres (1–4+34 inches) in diameter. The cap surface is sticky when moist, and characterized by white warts, which are easily detached. It is initially convex, and flattens out when mature. The flesh is white and does not change colour when cut. The gills are white and closely spaced. The stem is pale yellow, and measures 4–12 cm (1+584+34 in) long by 0.5–1.9 cm (1434 in) thick. The partial veil that covers the young fruit body turns into the ring on the stem at maturity. The spore print is white. It resembles numerous other species.

Contents

This species is a mycorrhizal fungus, widespread in Europe. It can grow either singly, scattered, or in groups. It prefers habitats like coniferous and mixed forests and alongside paths, where it fruits in summer and fall. It is a toxic mushroom, containing ibotenic acid and muscimol.

Description

Young specimen after several days of dry weather (note pale color of dry cap) 20060909 Amanita gemmata young.jpg
Young specimen after several days of dry weather (note pale color of dry cap)

The fruit bodies are colored yellow overall. The fresh cap, ranging in color from dull creamy yellow to golden yellow to buff, is sticky when moist. White warts adorn the cap surface, but they are usually flimsy and easily washed away by rain. They are placed randomly, but tend to be more concentrated in the center. The cap is typically 2.5–12 centimetres (1–4+34 inches) in diameter, and initially convex before flattening out in maturity. The flesh is white, and shows no change when sliced. [5]

The gills are adnate to adnexed, and white; they are close together, with little intervening space. The pale yellowish stem is 4–12 cm (1+584+34 in) long by 0.5–1.9 cm (1434 in) thick, and either roughly equal in width throughout, or slightly thicker at the base. Young mushrooms have a membranous partial veil extending from the upper stem to the cap margin; as the mushroom grows, the partial veil tears to leave a flimsy, skirt-like, easily lost ring on the stem. At the base of the stem is a white volva (a remnant of the universal veil that covered the immature mushroom) that usually forms a small, free rim. Spore prints are white. [6] There is no distinctive odour. [7]

Microscopic characteristics

The spores are thin-walled and ellipsoid. Amanita gemmata 51945.jpg
The spores are thin-walled and ellipsoid.

Amanita gemmata has ellipsoid to broadly ellipsoid spores measuring 8–10 by 6.5–7.5  μm with an average Q-ratio (the fraction of length/width) of 1.35; they are not amyloid. The spores are smooth, thin-walled, and they contain one to several small oil droplets. [3] The basidia (spore-bearing cells of the hymenium) are usually four-spored, club shaped, and measure 30–40 by 8–11 μm. [5]

The gill tissue is divergent, meaning that the cells are more or less parallel near the center of the gill, but bend outwards near the end of the gill. The hyphae in this tissue are cylindrical to inflated, thin walled, hyaline (translucent) to yellowish, and measure 2.2–9 μm wide; the hyphae in the central strand are narrower and typically cylindrical. The hyphae of the subhymenium (a layer of tissue directly under the hymenium) are interwoven. These hyphae are branched, cylindrical to slightly inflated, hyaline, and 6–9 μm wide. The hyphae of the cap cuticle are filamentous, interwoven, and radially arranged. They are cylindrical, 2.7–4 μm wide, thin-walled, hyaline to yellowish, and gelatinize when mounted in potassium hydroxide. The cap tissue is also interwoven, with hyphae that are cylindrical to somewhat inflated, 3.7–14.6 μm wide, thin-walled, branched, and hyaline to yellowish. Caulocystidia are abundant on the apex of the stem; they are club-shaped to cylindrical, thin-walled, hyaline, and measure 3–9 μm wide. The annulus tissue comprises interwoven cylindrical hyphae measuring 3–9 μm wide. Sphaerocysts (inflated, spherical cells) are also present in the annulus tissue; they are club shaped to ellipsoidal, with dimensions of 29–55 by 30–70 μm. The warts on the cap surface (remnants of the universal veil) comprise loosely interwoven cylindrical to inflated thin-walled hyphae that are 3.5–8 μm wide. Sphaerocysts in this tissue are 58.5–70.2 by 17.5–40 μm, ellipsoidal, and hyaline. The volval tissue is interwoven, with cylindrical, hyaline hyphae that are 4.4–7.3 μm wide. The sphaerocysts here are ellipsoidal to roughly spherical, hyaline, and measure 35–70 by 20–35 μm. In A. gemmata, where they are most abundant in the region just below the cap cuticle, these refractive cells are scattered, and have a width of 3.7–6 μm. Clamp connections are rare in the hyphae of A. gemmata; they are present in the annulus, gill tissue, subhymenium, and cap tissue. [5]

Similar species

There are numerous species in North America that resemble A. gemmata. [8] In 2005, mycologist Rod Tulloss described Amanita aprica , a species that has been confused with A. gemmata several times in the past. [9] According to mycologists Pierre Neville and Serge Poumarat, the Mediterranean species A. amici (synonymous with A. gemmata f. amici) [10] is similar in appearance to A. gemmata but is larger. According to Tulloss however, their measurements of the cap and stem dimensions of A. amici fell within the range expected for A. gemmata, and for this reason, the two taxa should be considered conspecific. [3] Neville and Poumarat suggest that the name A. gemmata still persists for Mediterranean collections because of its frequent historical misapplication to the native Italian species A. gioiosa , which had not been described as a distinct species until 2004. [3] A. orientigemmata , a mushroom ranging from Japan to China, is a lookalike, but has clamps, unlike A. gemmata. Other differences between the two species include the slightly smaller spores of A. orientigemmata, and differences in the microstructure of the cap warts. [11]

It is often confused with various other European species, resembling the false death cap, tawny grisette and panther cap mushrooms.[ citation needed ] Its cap is brighter in color than the former, and more yellow than the latter two.

Taxonomy

Amanita muscaria

Amanita roseitincta

Amanita gemmata

Amanita farinosa

Amanita ceciliae

Amanita fulva

Amanita vaginata

Amanita jacksonii

Phylogeny and relationships of A. gemmata and related species based on combined analyses of nLSU-DNA and mtSSU-DNA sequences. [12]

The species was first described scientifically by Swedish mycologist and botanist Elias Magnus Fries as Agaricus gemmatus in 1838. [13] It was transferred to the genus Amanita in 1866 by the French statistician Louis Bertillon. [14] The species has been transferred to several genera in its history, resulting in a number of synonyms, including Amanita muscaria var. gemmata (1886, Lucien Quélet), Amanitopsis gemmata (1887, Pier Andrea Saccardo), Amanitaria gemmata (1940, Jean-Edouard Gilbert), and Venenarius gemmatus (1948, William Murrill). [1] Amanita authority Rodham E. Tulloss considers A. amici (published by Claude Casimir Gillet in 1891) to be synonymous with A. gemmata, as the macroscopic characteristics of the former fall within the limits of the range expected for the latter. [3]

Within the genus Amanita , A. gemmata is classified in subgenus Amanita, section Amanita, subsection Gemmatae, and series Gemmatae. [3] Tulloss places the species in a stirps (an informal ranking above species level) with A. russuloides and A. viscidolutea . [15] Some mycologists believe that A. gemmata is not different from A. russuloides. [16] Two molecular studies based on sequences of the large ribosomal subunit RNA gene (nLSU-rDNA) and the mitochondrial small ribosomal subunit RNA gene (mtSSU-rDNA) show that A. gemmata is part of a clade within Amanita with its close relatives A. muscaria , A. farinosa and A. roseitincta . [12] [17]

The mushroom is commonly known as the "gemmed Amanita", the "jonquil Amanita", [6] or the "European gemmed Amanita". [3]

Distribution and habitat

A. gemmata specimen from Commanster, Belgium Amanita spec. - Lindsey 3a.jpg
A. gemmata specimen from Commanster, Belgium

The species is distributed in areas of Asia and Europe. It is widely distributed (as a species cluster, not the actual Amanita gemmata) in North America, [6] where it has been found as far south as Ixtlán de Juárez, Mexico. [18] The species has been reported from the Dominican Republic. [19] In South America, it is known from Chile and Colombia. [20] In Asia, the mushroom has been collected from Iran [21] and China. [22]

The fungus favours sandy and slightly acidic soils, and is often found in association with Norway Spruce (Picea abies). The mushroom grows either singly, scattered, or in groups in coniferous and mixed forests, especially along paths and roads. [6] [23]

Ecology

A. gemmata is a mycorrhizal fungus, meaning it forms a mutually beneficial relationship with the roots of compatible host plants. Through the association, the plant provides the fungus with a carbon source, and the fungus provides the plant with several benefits such as nutrients and protection from pathogens. Largent and collaborators (1980) document mycorrhizal associations of A. gemmata with Manzanita (Arctostaphylos spp.) and Pinus contorta (lodgepole pine), [24] and Nieto and Carbone with Pinus pinaster (maritime pine) in Spain. [25]

Toxicity

Toxicity is suspected to be due to the presence of muscimol and ibotenic acid, [26] which is also found in many species in section Amanita of the Amanita genus, including A. muscaria and A. pantherina .

Generally, symptoms of poisoning appear within three hours of ingestion of the mushroom as visual hallucinations, nausea, vomiting, stomach pain, diarrhea, irregular and slow heart beat and agitation. Severe cases involving coma, convulsions, or death are extremely rare. [27]

See also

Related Research Articles

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<i>Amanita persicina</i> Species of fungus

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<i>Amanita flavoconia</i> Species of fungus

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<i>Amanita vaginata</i> Species of fungus

Amanita vaginata, commonly known as the grisette or the grisette amanita, is an edible mushroom in the fungus family Amanitaceae. The cap is gray or brownish, 5 to 10 centimetres in diameter, and has furrows around the edge that duplicate the gill pattern underneath. Unlike many other Amanita mushrooms, A. vaginata lacks a ring on the stem.

<i>Amanita abrupta</i> Species of fungus

Amanita abrupta, commonly known as the American abrupt-bulbed amanita or the American abrupt-bulbed lepidella, is a toxic species of fungus in the family Amanitaceae. Named for the characteristic shape of its fruit bodies, this white Amanita has a slender stem, a cap covered with conical white warts, and an "abruptly enlarged" swollen base. This terrestrial species grows in mixed woods in eastern North America and eastern Asia, where it is thought to exist in a mycorrhizal relationship with a variety of both coniferous and deciduous tree species.

<i>Amanita daucipes</i> Species of fungus

Amanita daucipes is a species of fungus in the family Amanitaceae of the mushroom order Agaricales. Found exclusively in North America, the mushroom may be recognized in the field by the medium to large white caps with pale orange tints, and the dense covering of pale orange or reddish-brown powdery conical warts on the cap surface. The mushroom also has a characteristic large bulb at the base of its stem with a blunt short rooting base, whose shape is suggestive of the common names carrot-footed lepidella, carrot-foot amanita, or turnip-foot amanita. The mushroom has a strong odor that has been described variously as "sweet and nauseous", or compared to an old ham bone, or soap. Edibility is unknown for the species, but consumption is generally not recommended due its position in the Amanita subgroup Lepidella, which contains some poisonous members.

<i>Amanita onusta</i> Species of fungus

Amanita onusta, commonly known as the loaded Lepidella, the gunpowder Lepidella or the gunpowder amanita, is a species of fungus in the mushroom family Amanitaceae. It is characterized by its small to medium-sized fruit bodies that have white to pale gray caps crowded with roughly conical, pyramidal, or irregular gray warts. The stipe is whitish-gray with woolly or wart-like veil remnants, and at the base is a spindle- or turnip-shaped base that is rooted somewhat deeply in the soil.

<i>Amanita bisporigera</i> Poisonous species of fungus in the family Amanitaceae endemic to North America

Amanita bisporigera is a deadly poisonous species of fungus in the family Amanitaceae. It is commonly known as the eastern destroying angel amanita, the eastern North American destroying angel or just as the destroying angel, although the fungus shares this latter name with three other lethal white Amanita species, A. ocreata, A. verna and A. virosa. The mushroom has a smooth white cap that can reach up to 10 centimetres across and a stipe up to 14 cm tall with a white skirt-like ring near the top. The bulbous stipe base is covered with a membranous sac-like volva. The white gills are free from attachment to the stalk and crowded closely together. As the species name suggests, A. bisporigera typically bears two spores on the basidia, although this characteristic is not immutable. A. bisporigera closely resembles a few other white amanitas, including the equally deadly A. virosa and A. verna.

<i>Amanita aestivalis</i> Species of fungus

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<i>Amanita exitialis</i> Species of fungus

Amanita exitialis, also known as the Guangzhou destroying angel, is a mushroom of the large genus Amanita. It is distributed in eastern Asia, and probably also in India where it has been misidentified as A. verna. Deadly poisonous, it is a member of section Phalloideae and related to the death cap A. phalloides. The fruit bodies (mushrooms) are white, small to medium-sized with caps up to 7 cm (2.8 in) in diameter, a somewhat friable ring and a firm volva. Unlike most agaric mushrooms which typically have four-spored basidia, the basidia of A. exitialis are almost entirely two-spored. Eight people were fatally poisoned in China after consuming the mushroom in 2000, and another 20 have been fatally poisoned since that incident. Molecular analysis shows that the species has a close phylogenetic relationship with three other toxic white Amanitas: A. subjunquillea var. alba, A. virosa and A. bisporigera.

<i>Amanita australis</i> Species of fungus

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<i>Amanita nothofagi</i> Species of fungus

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<i>Amanita jacksonii</i> Species of fungus

Amanita jacksonii, also known as Jackson's slender amanita, American Slender Caesar, and Eastern Caesar's Amanita, is a North American species of fungus in the family Amanitaceae. It is a reddish-orange colored mushroom species which can be identified by its yellow gills, large, white, sacklike volva.

<i>Amanita atkinsoniana</i> Species of fungus

Amanita atkinsoniana, also known as the Atkinson's amanita, is a species of fungus in the family Amanitaceae. The fruit body is white to brownish, with caps up to 12.5 centimetres in diameter, and stems up to 20 cm long. The surface of the cap is covered with brownish conical warts.

<i>Amanita ravenelii</i> Species of fungus

Amanita ravenelii, commonly known as the pinecone lepidella, is a species of fungus in the family Amanitaceae. The whitish fruit bodies are medium to large, with caps up to 17 centimetres wide, and stems up to 25 cm (10 in) long. The cap surface has large warts and the stem has a scaly, bulbous base. The mushrooms have a unique chlorine like odor.

<i>Mycena mustea</i> Species of mushroom in the family Mycenaceae

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<i>Amanita rubrovolvata</i> Species of fungus

Amanita rubrovolvata, commonly known as the red volva amanita, is a species of fungus in the family Amanitaceae. The fungus produces small to medium-sized mushrooms, with reddish-orange caps up to 6.5 millimetres wide. The stems are up to 10 cm (4 in) tall, cream-coloured above the ring and cream to yellowish below it. The stem ends in a roughly spherical bulb at the base, which is covered with bright orange patches.

<i>Saproamanita thiersii</i> Species of fungus

Saproamanita thiersii, commonly called Thiers' lepidella, is a North American saprotrophic basidiomycete fungus in the genus Saproamanita. It is a white, small mushroom. Its cap is convex, measuring 3.5–10 centimetres across, and the stipe is 8–20 cm (3–8 in) long. The spore print is white.

<i>Lactarius rupestris</i> Species of fungus

Lactarius rupestris is a species of mushroom in the family Russulaceae. Described as a new species in 2010, it is known only from the semi-arid region in the National Park of Catimbau of Brazil. The mushroom is characterized by a stout fruit body with a smooth and sticky orange cap up to 7 cm (2.8 in) in diameter. The gills on the underside of the cap are closely spaced and frequently anastomosed. The stem is 35–45 mm (1.4–1.8 in) long by 18–21 mm (0.71–0.83 in) thick. The mushrooms exude a sparse cream-colored latex when cut or injured.

References

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