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Pleurotus Ostreatus

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Pleurotus Ostreatus Pleurotus Ostreatus Oyster Mushroom Pleurotus ostreatus, the oyster mushroom or oyster fungus, is a common edible mushroom. It was first cultivated in Germany as a subsistence measure during World War I and is now grown commercially around the world for food. It is related to the similarly cultivated king oyster mushroom. Oyster mushrooms can SCIENTIFIC CLASSIFICATION also be used industrially Kingdom : Fungi for mycoremediation purposes. Division : Basidiomycota Class : Agaricomycetes The oyster mushroom is one of the Order : Agaricales more commonly sought wild Family : Pleurotaceae mushrooms, though it can also be Genus : Pleurotus cultivated on straw and other media. It Species : P. ostreatus has the bittersweet aroma of benzaldehyde (which is also characteristic of bitter almonds). Binomial Name Pleurotus ostreatus Name Both the Latin and common names refer to the shape of the fruiting body. The Latin pleurotus (sideways) refers to the sideways growth of the stem with respect to the cap, while the Latin ostreatus (and the English common name, oyster) refers to the shape of the cap which resembles the bivalve of the same name. Many also believe that the name is fitting due to a flavor resemblance to oysters. The name oyster mushroom is also applied to other Pleurotus species. Or the grey oyster mushroom to differentiate it from other species in the genus. Description The mushroom has a broad, fan or oyster-shaped cap spanning 2– 3 3 30 cm ( ⁄4–11 ⁄4 in); natural specimens range from white to gray or tan to dark-brown; the margin is inrolled when young, and is smooth and often somewhat lobed or wavy. The flesh is white, firm, and varies in thickness due to stipe arrangement. The gills of the mushroom are white to cream, and descend on the stalk if present. If so, the stipe is off-center with a lateral attachment to wood. The spore print of the mushroom is white to lilac-gray, and best viewed on dark background. The mushroom's stipe is often absent. When present, it is short and thick. Omphalotus nidiformis is a toxic lookalike found in Australia and Japan. In North America, Omphalotus olivascens, the western jack-o'-lantern mushroom and Clitocybe dealbata, the ivory funnel mushroom, both bear a resemblance to Pleurotus ostreatus. Both Omphalotus olivascens and Clitocybe dealbata contain muscarine and are toxic. Carnivorous activity P. ostreatus is a carnivorous fungus, preying on roundworms by using a calcium-dependent toxin that paralyzes the prey within minutes of contact, causing necrosis and formation of a slurry to facilitate ingestion as a protein-rich food source. The carnivorous behavior and mechanism of paralysis appear to have been conserved in evolution of P. ostreatus and their prey roundworms over some 280–430 million years. Habitat The oyster mushroom is widespread in many temperate and subtropical forests throughout the world, although it is absent from the Pacific Northwest of North America, being replaced by P. pulmonarius and P. populinus.[9] It is a saprotroph that acts as a primary decomposer of Oyster mushrooms on a An example of agricultural cultivation of tree oyster mushrooms on straw. Wood, especially deciduous trees, and beech trees in particular. It is a white-rot wood-decay fungus. The oyster mushroom is one of the few known carnivorous mushrooms. Its mycelia can kill and digest nematodes, which is believed to be a way in which the mushroom obtains nitrogen. The standard oyster mushroom can grow in many places, but some other related species, such as the branched oyster mushroom, grow only on trees. They may be found all year round in the UK. While this mushroom is often seen growing on dying hardwood trees, it only appears to be acting saprophytically, rather than parasitically. As the tree dies of other causes, P. ostreatus grows on the rapidly increasing mass of dead and dying wood. They actually benefit the forest by decomposing the dead wood, returning vital elements and minerals to the ecosystem in a form usable to other plants and organisms. Culinary uses The oyster mushroom is a choice edible,[6] and is a delicacy in Japanese, Korean and Chinese cuisine. It is frequently served on its own, in soups, stuffed, or in stir-fry recipes with soy sauce. Oyster mushrooms may be used in sauces, such as oyster sauce. The mushroom's taste has been described as mild with a slight odor similar to anise. Oyster mushrooms are used in the Czech and Slovak contemporary cuisine in soups and stews in a similar fashion to meat.[11] The oyster mushroom is best when picked young; as the mushroom ages, the flesh becomes tough and the flavor becomes acrid and unpleasant .
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