Hypsizygus ulmarius | |
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Hypsizygus ulmarius mushroom | |
Scientific classification | |
Kingdom: | Fungi |
Division: | Basidiomycota |
Class: | Agaricomycetes |
Order: | Agaricales |
Family: | Lyophyllaceae |
Genus: | Hypsizygus |
Species: | H. ulmarius |
Binomial name | |
Hypsizygus ulmarius | |
Synonyms | |
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Hypsizygus ulmarius | |
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Gills on hymenium | |
Cap is convex or depressed | |
Hymenium is adnate or decurrent | |
Stipe is bare | |
Spore print is white to cream | |
Ecology is saprotrophic or parasitic | |
Edibility: edible |
Hypsizygus ulmarius, also known as the elm oyster mushroom, [1] and less commonly as the elm leech, [2] elm Pleurotus, is an edible fungus. It has often been confused with oyster mushrooms in the Pleurotus genus but can be differentiated easily as the gills are either not decurrent or not deeply decurrent. [3] While not quite as common as true oyster mushrooms, they have a wide range globally in temperate forests. [4] The mushrooms and vegetative hyphae of this species have been studied in recent years for their potential benefits to human health, [5] and mycoremediation. [6]
The taxonomic name of H. ulmarius means both “high up” (Hypsi-) and “yoke” (-zygus), referring to where the mushroom can be found attached to its host tree. The species name refers to elm (Ulmus spp.), a tree the fungus commonly grows on. This species was first described in 1791 as Agaricus ulmarius by Jean Baptiste Francois Pierre Bulliard, a French physician and botanist responsible for the first description of many species of fungi. [7] At this time, most gilled mushrooms were placed in this genus. With the creation of the genus Pleurotus by Paul Kummer for oyster mushrooms, this species was then named Pleurotus ulmarius. This was most likely due to the similar appearance of the fruiting body of these species. When famed French mycologist Robert Kühner revised fungi in the family Agaricales into more genera, the elm oyster mushroom was coined Lyophyllum ulmarium. However, this species was most recently moved to its current genus as Hypsizygus ulmarius in 1984 by Canadian mycologist Scott Redhead. [1] This move was based on ecological and morphological similarity to another species in Hypsizygus .
This final shift from Lyophyllum to Hypsizygus was supported by a later study comparing DNA for the large ribosomal subunit RNA coding region divergent domain (D2) of species in the genus Lyophyllum. Based on both culture morphologies and the phylogeny produced using the DNA, the authors agreed with Redhead's classification. [8] Further DNA evidence suggests that the genus Hypsizygus is polyphyletic, [9] however, meaning that these species lack a common ancestor in the current phylogeny. There is still much to learn about the phylogenetic relationship of the (currently three) species in the Hypsizygus genus.
Some texts also confuse this species with H. tessellatus due to their similar habitats and appearances. [10]
The mushrooms of this species appear white to cream, and are relatively uniform in color throughout. The stipe extends perpendicular from the fungus's host tree and then bends vertically to form the cap. The stipe is bare of any rings or other features. Additionally, the stipe connects almost perfectly in the center of the cap. The cap itself is usually about 6–15 cm (2.4–5.9 in) in diameter, though it may be larger, and is convex with an incurved margin. Larger caps can appear to be depressed. They will be uniform and smooth, though they can become aerolate as they age. [11] The gills are "adnate or only very slightly decurrent" in contrast with the gills of the commonly confused Pleurotus spp., which are deeply decurrent. [3] The mushrooms of H. ulmarius are often found in clusters of 1 to 3, though there may be more on larger tree wounds. [4]
Cultures of this species are known to produce both sexual and asexual spores. [8] The asexual arthrospores may be mono- or multinucleate. [12] There is conflicting data on the size of the sexual basidiospores of H. ulmarius, but the original description of the species by Redhead reports that they are usually about 5–7 micrometers in diameter. Their shape is subglobose to ellipsoidal. [11] The spore print of this species is white to pale cream. [3]
The H. ulmarius mushroom commonly grows on tree species like elm, box elder (Acer negundo), and beech, though it may be found on other trees as well. [11] [3] Elm oyster mushrooms are known to grow high up in the wounds or scars of the host tree. They are found in temperate forests across North America, Europe and Asia. [4] Despite how widespread they are, the mushrooms are relatively rare compared to their Pleurotus spp. lookalikes.
H. ulmarius is considered both a saprotroph [4] and parasite as it is not clear whether it feeds on live or dead tissue of its hosts, though it is found on live trees. [9] This species causes brown rot on damaged areas of its host species. Interestingly, however, this species also has a moderate ability to dissolve lignin, too, like a white rot fungus. [13] The fungus accomplishes this by using a complex suite of enzymes that dissolve both cellulose and lignin like laccase. It is not unheard of for brown-rot fungi to produce laccase, [14] an enzyme primarily involved in the lignin degradation process, but the fungus's use of the enzyme is rather uncommon. This production of a brown rot also helps differentiate the fungus from Pleurotus spp., which are mainly white rot fungi.
This species is also easily culturable on a variety of media types. It can also be grown in similar substrates as true oyster mushrooms: paper, straw, logs, etc.
Although many foragers feel that H. ulmarius mushrooms are tougher and do not taste as good as oyster mushrooms in the Pleurotus genus, they are still sought after in the wild. There are even commercially available kits to grow these mushrooms at home. [3] Like most edible mushrooms, they are good sources of protein, fiber, and Vitamin B.
There is both historical and modern interest in H. ulmarius’s possible medicinal applications, and most of these recent studies have been primarily performed in India. Studies have found compounds in both the mycelium and the fruiting body believed to be anti-inflammatory, antioxidant, antitumor [5] and antidiabetic. [15] It is considered a medicinal fungus in China. [16] [17]
Mycoremediation refers to the breakdown and removal of toxins from the environment using fungi. H. ulmarius has the demonstrated potential to accomplish this in a couple different ways. For example, the fungus uses the enzyme laccase to help decompose the lignin in the tissue of its host tree. Because this enzyme has low substrate specificity, it may be used to biodegrade materials like plastics. [18] Scientists are researching what affects laccase production in order to take advantage of this enzyme’s many uses. [19] Additionally, laccase produced by H. ulmarius has also been shown to degrade different dyes, which could prove useful in treating water. [6]
Edible mushrooms are the fleshy and edible fruit bodies of several species of macrofungi. They can appear either below ground (hypogeous) or above ground (epigeous) where they may be picked by hand. Edibility may be defined by criteria that include absence of poisonous effects on humans and desirable taste and aroma. Edible mushrooms are consumed for their nutritional and culinary value. Mushrooms, especially dried shiitake, are sources of umami flavor.
Polypores are a group of fungi that form large fruiting bodies with pores or tubes on the underside. They are a morphological group of basidiomycetes-like gilled mushrooms and hydnoid fungi, and not all polypores are closely related to each other. Polypores are also called bracket fungi or shelf fungi, and they characteristically produce woody, shelf- or bracket-shaped or occasionally circular fruiting bodies that are called conks.
Pleurotus ostreatus, the oyster mushroom, oyster fungus, hiratake, or pearl oyster mushroom is a common edible mushroom. It is one of the more commonly sought wild mushrooms, though it can also be cultivated on straw and other media.
Pleurotus eryngii is an edible mushroom native to Mediterranean regions of Europe, the Middle East, and North Africa, but also grown in many parts of Asia.
Pleurotus is a genus of gilled mushrooms which includes one of the most widely eaten mushrooms, P. ostreatus. Species of Pleurotus may be called oyster, abalone, or tree mushrooms, and are some of the most commonly cultivated edible mushrooms in the world. Pleurotus fungi have also been used in mycoremediation of pollutants, such as petroleum and polycyclic aromatic hydrocarbons.
Hericium erinaceus is an edible mushroom belonging to the tooth fungus group. Native to North America, Europe, and Asia, it can be identified by its long spines, occurrence on hardwoods, and tendency to grow a single clump of dangling spines. The fruit bodies can be harvested for culinary use.
Lignin-modifying enzymes (LMEs) are various types of enzymes produced by fungi and bacteria that catalyze the breakdown of lignin, a biopolymer commonly found in the cell walls of plants. The terms ligninases and lignases are older names for the same class, but the name "lignin-modifying enzymes" is now preferred, given that these enzymes are not hydrolytic but rather oxidative by their enzymatic mechanisms. LMEs include peroxidases, such as lignin peroxidase, manganese peroxidase, versatile peroxidase, and many phenoloxidases of the laccase type.
A wood-decay or xylophagous fungus is any species of fungus that digests moist wood, causing it to rot. Some species of wood-decay fungi attack dead wood, such as brown rot, and some, such as Armillaria, are parasitic and colonize living trees. Excessive moisture above the fibre saturation point in wood is required for fungal colonization and proliferation. In nature, this process causes the breakdown of complex molecules and leads to the return of nutrients to the soil. Wood-decay fungi consume wood in various ways; for example, some attack the carbohydrates in wood, and some others decay lignin. The rate of decay of wooden materials in various climates can be estimated by empirical models.
Omphalotus nidiformis, or ghost fungus, is a gilled basidiomycete mushroom most notable for its bioluminescent properties. It is known to be found primarily in southern Australia and Tasmania, but was reported from India in 2012 and 2018. The fan or funnel shaped fruit bodies are up to 30 cm (12 in) across, with cream-coloured caps overlain with shades of orange, brown, purple, or bluish-black. The white or cream gills run down the length of the stipe, which is up to 8 cm (3 in) long and tapers in thickness to the base. The fungus is both saprotrophic and parasitic, and its fruit bodies are generally found growing in overlapping clusters on a wide variety of dead or dying trees.
Armillaria tabescens is a species of fungus in the family Physalacriaceae. It is a plant pathogen. The mycelium of the fungus is bioluminescent.
Cerrena unicolor, commonly known as the mossy maze polypore, is a species of poroid fungus in the genus Cerrena. This saprobic fungus causes white rot.
Pleurotus dryinus is a species of fungus in the family Pleurotaceae. It grows on dead wood and is also a weak pathogen; infecting especially broad-leaved trees.
Daedalea quercina is a species of mushroom in the order Polyporales, and the type species of the genus Daedalea. Commonly known as the oak mazegill or maze-gill fungus, the specific epithet refers to the oak genus Quercus, upon which it frequently grows, causing a brown rot. It is found in Europe, Asia, Northern Africa and Australasia. Though inedible, it can be used as a natural comb and has been the subject of chemical research.
Panus conchatus, commonly known as the lilac oysterling, is an inedible species of mushroom that occurs throughout the Northern Hemisphere. Its fruitbodies are characterized by a smooth, lilac- or tan-colored cap, and decurrent gills. The fungus is saprophytic and fruits on the decomposing wood of a wide variety of deciduous and coniferous trees. Despite being a gilled species, phylogenetic analysis has shown it is closely related to the pored species found in the family Polyporaceae.
Pleurotus citrinopileatus, the golden oyster mushroom, is an edible gilled fungus. Native to eastern Russia, northern China, and Japan, the golden oyster mushroom is very closely related to P. cornucopiae of Europe, with some authors considering them to be at the rank of subspecies. In far eastern Russia, P. citrinopileatus, they are called iI'mak, is one of the most popular wild edible mushrooms.
Pleurotus populinus, the aspen oyster mushroom, is a gilled fungus native to North America. It is found on dead wood of aspen and cottonwood trees. Although morphologically similar to Pleurotus ostreatus and Pleurotus pulmonarius, it has been shown to be a distinct species incapable of cross-breeding. P. populinus is reported to be edible. Unlike P. ostreatus, which fruits in the autumn and winter, P. populinus fruits in late spring and summer.
Pleurotus tuber-regium, the king tuber mushroom, is an edible gilled fungus native to the tropics, including Africa, Asia, and Australasia. It has been shown to be a distinct species incapable of cross-breeding and phylogenetically removed from other species of Pleurotus.
Omphalotus japonicus, commonly known as the tsukiyotake(月夜茸), is an orange to brown-colored gilled mushroom native to Japan and Eastern Asia. It is a member of the cosmopolitan genus Omphalotus, the members of which have bioluminescent fruit bodies which glow in darkness. A 2004 molecular study shows it to be most closely related to a clade composed of Omphalotus nidiformis of Australia, Omphalotus olivascens of Western North America and Omphalotus olearius of Europe.
Fungi – "Fungi" is plural for "fungus". A fungus is any member of the group of eukaryotic organisms that includes unicellular microorganisms such as yeasts and molds, as well as multicellular fungi that produce familiar fruiting forms known as mushrooms. Biologists classify these organisms as a kingdom, Fungi, the second highest taxonomic rank of living organism beneath the Eukaryota domain; other kingdoms include plants, animals, protists, and bacteria. One difference that places fungi in a different kingdom is that their cell walls contain chitin, unlike the cell walls of plants, bacteria and some protists. Similar to animals, fungi are heterotrophs, that is, they acquire their food by absorbing dissolved molecules, typically by secreting digestive enzymes into their environment. Growth is their means of mobility, except for spores, which may travel through air or water. Fungi function as the principal decomposers in ecological systems.
Pleurotus cornucopiae is a species of edible fungus in the genus Pleurotus, It is quite similar to the better-known Pleurotus ostreatus, and like that species is cultivated and sold in markets in Europe and China, but it is distinguished because its gills are very decurrent, forming a network on the stem.