Laccaria amethystina | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Fungi |
Division: | Basidiomycota |
Class: | Agaricomycetes |
Order: | Agaricales |
Family: | Hydnangiaceae |
Genus: | Laccaria |
Species: | L. amethystina |
Binomial name | |
Laccaria amethystina | |
Synonyms | |
Laccaria laccata var. amethystina (Cooke) Rea Laccaria hudsonii Pázmány (1994) |
Laccaria amethystina | |
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Gills on hymenium | |
Cap is convex or depressed | |
Hymenium is adnate or decurrent | |
Stipe is bare | |
Spore print is white | |
Ecology is mycorrhizal | |
Edibility is edible |
Laccaria amethystina, commonly known as the amethyst deceiver, or amethyst laccaria, [1] is a small brightly colored mushroom, that grows in deciduous and coniferous forests. The mushroom itself is edible, but can absorb arsenic from the soil. Because its bright amethyst coloration fades with age and weathering, it becomes difficult to identify, hence the common name "deceiver". This common name is shared with its close relation Laccaria laccata that also fades and weathers. It is found mainly in Northern temperate zones, though it is reported to occur in tropical Central and South America as well. Recently, some of the other species in the genus have been given the common name of "deceiver".
This species was first described in 1778 by well-known English botanist and apothecary William Hudson as Agaricus amethystinus, and later put into the genus Laccaria by Mordecai Cubitt Cooke. The amethyst deceiver has had many binomials over a great many years, but reference to the amethyst coloration is featured in most of these. It was once placed in the genus Collybia , as Collybia amethystina, which was probably due in part to its tough collybioid-like stem. Its present binomial places it in the genus Laccaria, with the specific epithet amethystina, a pairing first used by Cooke in 1884. In 1922 it was named as a variant of Laccaria laccata , Laccaria laccata var. amethystina (Cooke) Rea, which is now a synonym.
The cap is 1–6 cm in diameter, and is initially convex, later flattening, and often with a central depression (navel). When moist it is a deep purplish lilac, which fades upon drying out. It is sometimes slightly scurfy at the center, [2] and has pale striations at the margin. [3]
The stem is the same colour as the cap, and has whitish fibrils at the base, which become mealy at the top. [2] It is fibrous, hollow, fairly tough when rolled in the fingers, with dimensions of 0.6 to 7 centimetres (0.24 to 2.76 in) long by 0.1 to 0.7 centimetres (0.039 to 0.276 in) thick. [2] The flesh is without a distinctive taste or smell, and is thin, with pale lilac coloration. [2] The gills are colored as the cap, often quite distantly spaced, and are dusted by the white spores; their attachment to the stem is sinuate—having a concave indentation before attaching to the stem. [2]
The spores are spherical and hyaline, and bear pointed spines (echinulate) that are long relative to the size of the spore; they typically have dimensions of 7–10 by 7–10 μm. The basidia, the spore-bearing cells, are club-shaped and hyaline, and are 30–64.5 by 8.5–14 μm. [4]
Laccaria amethystina is a common species in most temperate zones of Europe, Asia, Central, South, and eastern North America. It grows solitary to scattered with a variety of deciduous and coniferous trees, with which it is mycorrhizally associated, though it most commonly occurs with trees in the Fagales. [3] It appears in late summer to early winter, and often with beech; [2] in Central and South America, it more commonly grows in association with oak. [4] Research has shown that L. amethystina is a so-called "ammonia fungus", an ecological classification referring to those fungi that grow abundantly on soil after the addition of ammonia, or other nitrogen-containing material; [5] the congeneric species Laccaria bicolor is also an ammonia fungus. [4]
As with other members of the genus Laccaria, this species is edible, though generally not considered a choice edible.[ citation needed ] While not inherently toxic, in soils that are polluted with arsenic, it can bioaccumulate a high concentration of that element. [3]
There are several purplish species in North America that were formally labeled as L. amethystina before Gregory M. Mueller described them as distinct species in 1984. [6] Laccaria amethysteo-occidentalis is found in western North America, where L. amethystina does not occur. It is a very common mushroom in its geographical range.[ citation needed ] Besides geographical difference, L. amethysteo-occidentalis differs from L. amethystina in several ways: ecologically, the former occurs only in association with conifers, while the latter occurs mainly with hardwoods of the order Fagales. The sporocarp of L. amethysteo-occidentalis is on average larger than that of L. amethystina, and has a deeper purple coloration, that fades to vinaceous rather than brownish shades. The spores are also quite distinct between the two, in that the spores of L. amethysteo-occidentalis are not as strongly globose as those of L. amethystina, being generally of a subglobose or even broadly ellipsoid shape, and additionally having much shorter spines than the spores of L. amethystina. [7] [8] [9]
Another species that was segregated by Mueller from L. amethystina is Laccaria vinaceobrunnea, a species found in the Gulf Coast region of the southern United States. L. vinaceobrunnea is distinguished from L. amethystina and L. amethysteo-occidentalis macroscopically by color, with the former species having a deep purple color only in very young specimens, which soon fades to a violaceous- or reddish-brown color, and eventually to dull orange-brown or buff color with age. Its spore features are intermediate between L. amethystina and L. amethysteo-occidentalis, having a subglobose to broadly ellipsoid shape like L. amethysteo-occidentalis (rather than the strongly globose shape of L. amethystina spores) and long spines characteristic of L. amethystina. [10] [11] [12] The pileipellis of L. vinaceobrunnea is unique within Laccaria, having a distinct palisadoderm, rather than the undifferentiated type or fasciculate trichoderm that is characteristic of other species of Laccaria. [10] [11] [12] [13] L. vinaceobrunnea is also somewhat distinguished by habitat, being highly specific in association with Quercus virginiana . L. amethystina is also often associated with this species, but is associated with many other tree species in the Fagales as well. [10] [11] [12]
In 1988, a third species of purple Laccaria, Laccaria gomezii, was described by Mueller as distinct from L. amethystina. This species is associated with Quercus and is endemic to the cloud forests of Central America and northern South America (habitats in which L. amethystina also occurs). L. gomezii is similar to L. vinaceobrunnea in a number of characteristics, but the fresh sporocarp is a darker purple than either L. vinaceobrunnea or L. amethystina. Its lamellae distinguish it from other members of the L. amethystina group, with L. gomezii having attached to subdecurrant, very closely spaced lamellae, in contrast to the sinuate to arcuate, narrowly attached lamellae of other species in this group. The spores of L. gomezii are similar to those of L. vinaceobrunnea and Laccaria amethysteo-occidentalis, and it lacks the distinct pileipellis hyphae of L. vinaceobrunnea. [14] [15]
Secotioid fungi are an intermediate growth form between mushroom-like hymenomycetes and closed bag-shaped gasteromycetes, where an evolutionary process of gasteromycetation has started but not run to completion. Secotioid fungi may or may not have opening caps, but in any case they often lack the vertical geotropic orientation of the hymenophore needed to allow the spores to be dispersed by wind, and the basidiospores are not forcibly discharged or otherwise prevented from being dispersed —note—some mycologists do not consider a species to be secotioid unless it has lost ballistospory.
Psilocybe cyanescens, commonly known as the wavy cap or potent psilocybe, is a species of potent psychedelic mushroom. The main compounds responsible for its psychedelic effects are psilocybin and psilocin. It belongs to the family Hymenogastraceae. A formal description of the species was published by Elsie Wakefield in 1946 in the Transactions of the British Mycological Society, based on a specimen she had recently collected at Kew Gardens. She had begun collecting the species as early as 1910. The mushroom is not generally regarded as being physically dangerous to adults. Since all the psychoactive compounds in P. cyanescens are water-soluble, the fruiting bodies can be rendered non-psychoactive through parboiling, allowing their culinary use. However, since most people find them overly bitter and they are too small to have great nutritive value, this is not frequently done.
Galerina is a genus of small brown-spore saprobic fungi, with over 300 species found throughout the world from the far north to remote Macquarie Island in the Southern Ocean. The genus is most noted for some extremely poisonous species which are occasionally confused with hallucinogenic species of Psilocybe. Species are typically small and hygrophanous, with a slender and brittle stem. They are often found growing on wood, and when on the ground have a preference for mossy habitats.
A cystidium is a relatively large cell found on the sporocarp of a basidiomycete, often between clusters of basidia. Since cystidia have highly varied and distinct shapes that are often unique to a particular species or genus, they are a useful micromorphological characteristic in the identification of basidiomycetes. In general, the adaptive significance of cystidia is not well understood.
Laccaria laccata, commonly known as the deceiver, lackluster laccaria, or waxy laccaria, is a white-spored species of small edible mushroom found throughout North America and Europe. It is a highly variable mushroom, and can look quite washed out, colorless and drab, but when younger it often assumes red, pinkish brown, and orange tones. The species is often considered by mushroom collectors to be a 'mushroom weed' because of its abundance and plain stature.
Laccaria bicolor is a small tan-colored mushroom with lilac gills. It is edible but not choice, and grows in mixed birch and pine woods. It is found in the temperate zones of the globe, in late summer and autumn. L. bicolor is an ectomycorrhizal fungus used as a soil inoculant in agriculture and horticulture.
Collybia nuda, commonly known as the blewit or wood blewit and previously described as Lepista nuda and Clitocybe nuda, is an edible mushroom native to Europe and North America. Described by Pierre Bulliard in 1790, it was also known as Tricholoma nudum for many years. It is found in both coniferous and deciduous woodlands. It is a fairly distinctive mushroom that is widely eaten. It has been cultivated in Britain, the Netherlands and France. This species was reassigned to the genus Collybia in 2023.
Hygrocybe conica is a species of agaric in the family Hygrophoraceae. In the UK it has been given the recommended English name of blackening waxcap, since all parts of the basidiocarp blacken with age. In North America it is commonly known as the witch's hat, conical wax cap or conical slimy cap. Hygrocybe conica is known to be a complex of at least eleven closely related species and as such is widespread in Europe, North America, Asia, and elsewhere.
Collybia personata is a species of edible fungus commonly found growing in grassy areas across Europe and is morphologically related to the wood blewit Collybia nuda. This mushroom was moved to the genus Collybia in 2023.
Laccaria is a genus around 75 species of fungus found in both temperate and tropical regions of the world. They are mycorrhizal. The type species is Laccaria laccata, commonly known as the deceiver. Other notable species include L. bicolor, and the amethyst deceiver (L. amethystina), sometimes incorrectly written as L. amethystea. Because some Laccaria species have the ability to grow vegetatively and/or germinate from basidiospores in culture, they are often used as experimental systems for studies of ectomycorrhizal basidiomycetes. They have a tetrapolar mating system, meaning that there the mating type is controlled by 2 loci. Recently, the genome of L. bicolor has been sequenced.
Inocybe geophylla, commonly known as the earthy inocybe, common white inocybe or white fibercap, is a poisonous mushroom of the genus Inocybe. It is widespread and common in Europe and North America, appearing under both conifer and deciduous trees in summer and autumn. The fruiting body is a small all-white or cream mushroom with a fibrous silky umbonate cap and adnexed gills. An all-lilac variety lilacina is also common.
The Hydnangiaceae are a family of fungi in the mushroom order Agaricales. Widespread in temperate and tropical regions throughout the world, the family contains about 30 species in four genera. Species in the Hydnangiaceae form ectomycorrhizal relationships with various species of trees in both coniferous and deciduous forests.
Dendrocollybia is a fungal genus in the family Tricholomataceae of the order Agaricales. It is a monotypic genus, containing the single species Dendrocollybia racemosa, commonly known as the branched collybia or the branched shanklet. The somewhat rare species is found in the Northern Hemisphere, including the Pacific Northwest region of western North America, and Europe, where it is included in several Regional Red Lists. It usually grows on the decaying fruit bodies of other agarics—such as Lactarius and Russula—although the host mushrooms may be decayed to the point of being difficult to recognize.
Sarcoscypha occidentalis, commonly known as the stalked scarlet cup or the western scarlet cup, is a species of fungus in the family Sarcoscyphaceae of the Pezizales order. Phylogenetic analysis has shown that it is most closely related to other Sarcoscypha species that contain large oil droplets in their spores. S. occidentalis has an imperfect form, classified as Molliardiomyces occidentalis.
Russula turci is a common, edible, Russula mushroom, found under pines and spruces, on sandy soil and clay.
Laccaria amethysteo-occidentalis is a mushroom found under conifers, usually pine, growing alone, scattered or gregariously in western North America.
Collybia cookei is a species of fungus in the family Tricholomataceae, and one of three species in the genus Collybia. It is known from Europe, Asia, and North America. The fungus produces fruit bodies that usually grow on the decomposing remains of other mushrooms, like Meripilus giganteus, Inonotus hispidus, or species of Russula; occasionally fruit bodies are found on rich humus or well-decayed wood. The fungus produces small white mushrooms with caps up to 9 mm (0.35 in) in diameter, supported by thin stems that originate from a yellowish-brown sclerotium. The mushroom is difficult to distinguish from the other two species of Collybia unless an effort is made to examine the sclerotia, which is usually buried in the substrate. The edibility of the mushroom has not been determined.
Entoloma bloxamii, commonly known as the midnight blue entoloma, or big blue pinkgill, is a species of agaric in the family Entolomataceae. The species has a European distribution, occurring mainly in agriculturally unimproved grassland. Entoloma bloxamii has been reported from North America, but at least some of these reports represent a distinct species, Entoloma medianox. Threats to its habitat have resulted in the Big Blue Pinkgill being assessed as globally "vulnerable" on the IUCN Red List of Threatened Species.
Entoloma porphyrophaeum is a species of agaric in the family Entolomataceae. It has been given the recommended English name of Lilac Pinkgill. The species has a European distribution, occurring mainly in agriculturally unimproved grassland. Entoloma porphyrophaeum has been reported from North America, but at least some of these reports represent a distinct species, Entoloma canadense. Threats to its habitat have resulted in the Lilac Pinkgill being assessed as globally "vulnerable" on the IUCN Red List of Threatened Species.
Collybiopsis confluens, commonly known as the clustered toughshank, is a type of mushroom from the Omphalotaceae family. The fruiting body appears from summer until autumn in deciduous and coniferous forests. Collybiopsis confluens is not an edible mushroom.