Brown star-footed amanita | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Fungi |
Division: | Basidiomycota |
Class: | Agaricomycetes |
Order: | Agaricales |
Family: | Amanitaceae |
Genus: | Amanita |
Species: | A. brunnescens |
Binomial name | |
Amanita brunnescens G.F.Atk. (1918) | |
Amanita brunnescens | |
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Gills on hymenium | |
Cap is convex | |
Hymenium is free | |
Stipe has a ring and volva | |
Spore print is white | |
Ecology is mycorrhizal | |
Edibility is unknown |
Amanita brunnescens, also known as the brown American star-footed amanita [1] [2] or cleft-footed amanita is a native North American mushroom of the large genus Amanita . It differs from A. phalloides (the death cap) by its fragile volva and tendency to bruise brown.
Originally presumed to be the highly toxic Amanita phalloides (the death cap) by renowned American mycologist Charles Horton Peck, it was described and named by George F. Atkinson of Cornell University. He named it after the fact that it bruised brown. [3]
Amanita brunnescens has a mostly brown cap, with possible tones of olive, grey, or red. At maturity the cap is often around 8–9 centimetres (3+1⁄4–3+1⁄2 inches) wide. The cap margins lack universal veil remnants. The shape of the cap can be bell-shaped to convex, becoming planar as it matures. The flesh within the cap is mostly white or cream and can bruise brown. The characteristic Amanita gills are free from the stipe and white. The stipe is also white, with a smooth basal bulb that distinctly splits into a "cleft-foot". It stains reddish-brown on the lower half, especially when handled, and averages about 9 cm tall. A partial veil is present, often white with possible brown coloration. There is no volva, but there may be volval remnants if the fruiting body is excavated carefully, that are white to brownish. [1]
The odor, if present, is of raw potatoes. a piece of the stipe may need to be cut in order to detect the faint scent. [1]
The spore print is white, and "the spores measure (7.0-) 8.0–9.2 (-9.5) × (6.5-) 7.2–8.5 (-9.2) μm and are globose to subglobose (occasionally broadly ellipsoid) and amyloid. Clamps are absent from bases of basidia." [1]
Amanita brunnescens var. pallida is almost identical to the description above, but with a white cap color. [1]
A. brunnescens' most distinguishing features are the characteristic Amanita stature with warts and partial veil, as well as the cleft foot and reddening base.
Successful mushroom identification relies on the collection of mature, healthy and undamaged specimens. Amanitas can be separated from other agarics by their (usually) tall and slender stature, presence of universal veil remnants and/or a volva, and sometimes a partial veil. Other genera with volvas include Volvariella and Volvopluteus which will never have a partial veil or universal veil remnants on the cap. Those genera also have pink spore prints instead of Amanita's white. [4] [5]
Section Validae, to which A. brunnescens belongs, can be distinguished from other Amanita sections via the smooth bulbous base without a volva, stipe with a partial veil, and no veil remnants hanging off of cap margin. Other Amanita sections have either a conspicuous volva or a concentric/scaly stipe base. [6]
Amanita amerirubescens has an indistinct (sometimes a little swollen) stipe base, a brassy yellow to reddish cap, and when young, yellowish warts on cap. This species also reddens. [7]
Amanita flavorubens is similar to A. amerirubescens, but has a yellower cap and warts that retain their yellow color for longer. [8]
Amanita asteropus is the European version of A. brunnescens. [9]
It is of unknown edibility and may be poisonous. [10]
Amanita gemmata, commonly known as the gemmed amanita 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 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 long by 0.5–1.9 cm 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.
Amanita calyptroderma also known as coccora, coccoli or the Pacific amanita, is a white-spored mushroom that fruits naturally in the Sierra Nevada mountains and coastal forests of the western United States during the fall, winter and spring.
Amanita arocheae, also known as the Latin American death cap, is a mushroom of the large genus Amanita, which occurs in Colombia, Central America and South America. Deadly poisonous, it is a member of section Phalloideae and related to the death cap, A. phalloides.
Amanita persicina, commonly known as the peach-colored fly agaric, is a basidiomycete fungus of the genus Amanita with a peach-colored center. Until c. 2015, the fungus was believed to be a variety of A. muscaria.
Amanita abrupta, commonly known as the American abrupt-bulbed amanita or the American abrupt-bulbed lepidella, is a possibly 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.
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 of species belonging to Amanita subgroup Lepidella is risky.
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.
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.
Amanita aestivalis, commonly known as the white American star-footed amanita, is a species of fungus in the mushroom family Amanitaceae. The cap of the white fruit body is 5 to 8.5 centimetres in diameter. It sits atop a stem that is 8.5 to 16 cm long. The entire fruit body will slowly stain a reddish-brown color in response to bruising. A. aestivalis may be a synonym for A. brunnescens, and may be confused with several other white-bodied amanitas. The fungus is distributed in eastern North America.
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.
Amanita australis is a species of fungus in the family Amanitaceae. It produces small- to medium-sized fruit bodies, with brown caps up to 9 centimetres in diameter covered with pyramidal warts. The gills on the underside of the cap are white, closely crowded together, and free from attachment to the stem. The stem, up to 9 cm long, has a ring and a bulbous base. The mushroom may be confused with another endemic New Zealand species, A. nothofagi, but can be distinguished by differences in microscopic characteristics.
Amanita nothofagi is a species of fungus in the family Amanitaceae. Endemic to New Zealand, the species was first described by mycologist Greta Stevenson in 1962. The fruit bodies have dark brown caps that are up to 13 cm (5.1 in) in diameter and covered with patches of soft greyish-brown scales or warts. The gills underneath the cap are crowded together, free from attachment to the stem, and white, becoming tinged with yellow in age. The stem of the mushroom is 4–14 cm (1.6–5.5 in) long by 0.5–2.5 cm (0.2–1.0 in) thick, and has a ring. The spore print is white, and individual spores are spherical to ellipsoid, measuring 7.5–9 by 7.5–9 micrometres. The mushroom may be confused with another New Zealand species, A. australis, but can be distinguished by certain characteristics. Amanita nothofagi is a mycorrhizal species, and grows in association with native New Zealand trees such as Southern Beech.
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.
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.
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 centimetres 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.
Amanita ceciliae, commonly called snakeskin grisette, strangulated amanita, and the Cecilia's ringless amanita, is a basidiomycete fungus in the genus Amanita. First described in 1854 by Miles Joseph Berkeley and Christopher Edmund Broome, it was given its current name by Cornelis Bas in 1984. It is characterized by bearing a large fruit body with a brown cap 5–12 cm (2.0–4.7 in) across. The cap has charcoal-grey patches, which are easily removable. The stipe is 7–18 cm (2.8–7.1 in) long, white in colour, and there is no ring on it. It is slightly tapered to the top and has irregular cottony bands girdling the base. The universal veil is grey. Spores are white, spherical in shape, non-amyloid, and measure 10.2–11.7 micrometres. The mushrooms are considered edible, but field guides typically advise caution in selecting them for consumption, due to risks of confusion with similar toxic species. A. ceciliae is found in woods throughout Europe and North America, where it fruits during summer and autumn.
Amanita augusta, commonly known as the western yellow-veil, is a small tannish-brown mushroom with cap colors bright yellow to dark brown and various combinations of the two colors. The mushroom is often recognizable by the fragmented yellow remnants of the universal veil. This mushroom grows year-round in the Pacific Northwest but fruiting tends to occur in late fall to mid-winter. The fungus grows in an ectomycorrhizal relationship with hardwoods and conifers often in mixed woodlands.
Zhuliangomyces illinitus is a mushroom-forming fungus species of genus Zhuliangomyces in the family Amanitaceae in the order Agaricales. It has been known most recently as Limacella illinita. Also known previously as Agaricus illinitus and Mastocephalus illinitus. This fungus is known for its distinctive slimy cap. Z. illinitus is commonly known as the dripping slimecap or the overflowing slimy stem.
Amanita silvicola, also known as the woodland amanita or kauffman's forest amanita, is a species of Amanita found in coniferous woods the Pacific Northwest and California.