Portal:Fungi

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A fungus is any member of a large group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. The Fungi are classified as a kingdom that is separate from plants and animals. The discipline of biology devoted to the study of fungi is known as mycology or fungal biology, which is historically regarded as a branch of botany, even though genetic studies have shown that fungi are more closely related to animals than to plants. Fungi reproduce via spores and grow as hyphae, mycelia, and futher specialized structures. Fungal spores are often produced on specialized structures or in fruiting bodies, such as the head of a mushroom. Abundant worldwide, most fungi are mostly invisible to the naked eye because of the small size of their structures, and their cryptic lifestyles in soil, on dead matter, and as symbionts of plants, animals, or other fungi. Fungi perform an essential role in the decomposition of organic matter and have fundamental roles in nutrient cycling and exchange. They have long been used as a direct source of food, such as mushrooms and truffles, as a leavening agent for bread, and in fermentation of various food products, such as wine, beer, and soy sauce.

Since the 1940s, fungi have been used for the production of antibiotics, and, more recently, various enzymes produced by fungi are used industrially and in detergents. Fungi are also used as biological agents to control weeds and pests. Many species produce bioactive compounds called mycotoxins, such as alkaloids and polyketides, that are toxic to animals including humans. The fruiting structures of a few species are consumed recreationally or in traditional ceremonies as a source of psychotropic compounds. Fungi can break down manufactured materials and buildings, and become significant pathogens of humans and other animals. Losses of crops due to fungal diseases or food spoilage can have a large impact on human food supplies and local economies. Despite their importance on human affairs, little is known of the true biodiversity of Kingdom Fungi, which has been estimated at around 1.5 million species, with about 5% of these having been formally classified.

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Amanita phalloides (generally /æməˈnaɪtə fəˈlɔɪdiːz/), commonly known as the death cap, is a poisonous basidiomycete fungus, one of many in the genus Amanita. Widely distributed across Europe, A. phalloides associates with various deciduous trees. In some cases, death cap has been accidentally introduced to new regions with the cultivation of non-native species of oak, chestnut, and pine. The large fruiting bodies (i.e., the mushrooms) appear in summer and autumn; the caps are generally greenish in colour, with a white stipe and gills.

Coincidentally, these toxic mushrooms resemble several edible species (most notably the straw mushroom) commonly consumed by humans, increasing the risk of accidental poisoning. A. phalloides is one of the most poisonous of all known toadstools. It has been involved in the majority of human deaths from mushroom poisoning, possibly including the deaths of Roman Emperor Claudius and Holy Roman Emperor Charles VI. It has been the subject of much research, and many of its biologically active agents have been isolated. The principal toxic constituent is α-amanitin, which damages the liver and kidneys, often fatally. No definitive antidote is known.

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Mycena californiensis is a species of fungus in the family Mycenaceae. It is a common and abundant species in the coastal oak woodlands of California, where it grows saprobically, feeding on the fallen leaves and acorns of various oak species. First described in 1860 by Berkeley and Curtis, the species was collected four years earlier during an exploring and surveying expedition. It was subsequently considered a doubtful species by later Mycena researchers, until a 1999 publication validated the taxon. Mycena elegantula is considered a synonym.

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Credit: Robert Sasata

Lycoperdon pyriforme, a species of puffball, growing on a decaying pine log near La Ronge, Saskatchewan, Canada.

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Did you know?

... that the edible mushroom Hygrophorus agathosmus smells like almonds?
... that it is uncertain whether the brown and white American star-footed Amanitas are different species?
... that the rare Banksia verticillata is threatened by three fungi – aerial canker, dieback and honey mushroom?
... that the red pigment of the Christmas wreath lichen is one of several chemicals that help the organism survive inhospitable environments?
... that the cap of the suede bolete has soft velvety skin?

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General images - show new batch

The following are images from various fungi-related articles on Wikipedia.

Image 1Psilocybe zapotecorum, a hallucinogenic mushroom (from Mushroom)
Image 2Morchella elata asci viewed with phase contrast microscopy (from Mushroom)
Image 3The blue gills of Lactarius indigo, a milk-cap mushroom (from Mushroom)
Image 4
Diagram of a mycoloop (fungus loop)
Parasitic chytrids can transfer material from large inedible phytoplankton to zooplankton. Chytrids zoospores are excellent food for zooplankton in terms of size (2–5 μm in diameter), shape, nutritional quality (rich in polyunsaturated fatty acids and cholesterols). Large colonies of host phytoplankton may also be fragmented by chytrid infections and become edible to zooplankton. (from Marine fungi)
Image 5A mushroom (probably Russula brevipes) parasitized by Hypomyces lactifluorum resulting in a "lobster mushroom" (from Mushroom)
Image 6Chytrid parasites of marine diatoms. (A) Chytrid sporangia on Pleurosigma sp. The white arrow indicates the operculate discharge pore. (B) Rhizoids (white arrow) extending into diatom host. (C) Chlorophyll aggregates localized to infection sites (white arrows). (D and E) Single hosts bearing multiple zoosporangia at different stages of development. The white arrow in panel E highlights branching rhizoids. (F) Endobiotic chytrid-like sporangia within diatom frustule. Bars = 10 μm. (from Marine fungi)
Image 7Ling Zhi-8, an immunomodulatory protein isolated from Ganoderma lucidum (from Medicinal uses of fungi)
Image 8A tinder fungus, Fomes fomentarius (from Mushroom)
Image 9Close-up cross section of mushroom. (from Mushroom)
Image 10
Driftwood
(from Marine fungi)
Image 11Maitake, a polypore mushroom (from Mushroom)
Image 12Salmon with fungal disease (from Marine fungi)
Image 13
Mycoloop links between phytoplankton and zooplankton
Chytrid‐mediated trophic links between phytoplankton and zooplankton (mycoloop). While small phytoplankton species can be grazed upon by zooplankton, large phytoplankton species constitute poorly edible or even inedible prey. Chytrid infections on large phytoplankton can induce changes in palatability, as a result of host aggregation (reduced edibility) or mechanistic fragmentation of cells or filaments (increased palatability). First, chytrid parasites extract and repack nutrients and energy from their hosts in form of readily edible zoospores. Second, infected and fragmented hosts including attached sporangia can also be ingested by grazers (i.e. concomitant predation). (from Marine fungi)
Image 14The photochemistry of vitamin D₂ biosynthesis (from Medicinal uses of fungi)
Image 15Phylogenetic and symbiogenetic tree of living organisms, showing a view of the origins of eukaryotes and prokaryotes (from Marine fungi)
Image 16
Lichen covered rocks
(from Marine fungi)
Image 17The red yeast rice fungus, Monascus purpureus, can synthesize three statins. (from Medicinal uses of fungi)
Image 18Ganoderma lingzhi (from Mushroom)
Image 19Group photograph taken at a meeting of the British Mycological Society in 1913 (from Mycology)
Image 20There are over 100 psychoactive mushroom species of genus Psilocybe native to regions all around the world. (from Mushroom)
Image 21Psychotropic mushroom Amanita muscaria, commonly known as "fly agaric" (from Mushroom)
Image 22Agaricus bisporus mushroom is a cultivated edible mushroom for foods and has many names such as "champignon", " button mushroom", "white mushroom", and " portobello" (from Mushroom)
Image 23Culinary mushrooms in a diversity of shapes and colors (from Mushroom)
Image 24Tinea corporis (from Fungal infection)
Image 25Typical mating fusion of two compatible monokaryons in Basidiomycota (from Mating in fungi)
Image 26
Roles of fungi in the marine carbon cycle
Roles of fungi in the marine carbon cycle by processing phytoplankton-derived organic matter. Parasitic fungi, as well as saprotrophic fungi, directly assimilate phytoplankton organic carbon. By releasing zoospores, the fungi bridge the trophic linkage to zooplankton, known as the mycoloop. By modifying the particulate and dissolved organic carbon, they can affect bacteria and the microbial loop. These processes may modify marine snow chemical composition and the subsequent functioning of the biological carbon pump. (from Marine fungi)
Image 27Ferula mushroom in Bingöl, Turkey . This is an edible type of mushroom. (from Mushroom)
Image 28Fungi within Zygomycota form progametangia with suspensors during mating (from Mating in fungi)
Image 29Onychomycosis (from Fungal infection)
Image 30Mushrooms are considered a kind of fungal reproductive organ. (from Mycology)
Image 31Amanita jacksonii buttons emerging from their universal veils (from Mushroom)
Image 32Pennate diatom from an Arctic meltpond, infected with two chytrid-like [zoo-]sporangium fungal pathogens (in false-colour red). Scale bar = 10 μm. (from Marine fungi)
Image 33Fungi within Ascomycota form ascogonium and antheridium with trichogyne bridge (from Mating in fungi)
Image 34Boletus edulis, also known as "cep", is an edible wild bolete found in Europe (from Mushroom)
Image 35Oral candidiasis (from Fungal infection)
Image 36Morphological characteristics of the caps of mushrooms (from Mushroom)
Image 37Eumycetoma (from Fungal infection)
Image 38Agaricus bitorquis mushroom emerging through asphalt concrete in summer (from Mushroom)
Image 39Agaricus bisporus, one of the most widely cultivated and consumed mushrooms (from Mushroom)
Image 40Pityriasis versicolor (from Fungal infection)
Image 41Amanita muscaria, the most easily recognised "toadstool", is frequently depicted in fairy stories and on greeting cards. It is often associated with gnomes. (from Mushroom)
Image 42Yellow flower pot mushrooms (Leucocoprinus birnbaumii) at various states of development (from Mushroom)
Image 43Neurospora crassa life cycle. The haploid mycelium reproduces asexually by two processes: (1) simple proliferation of existing mycelium, and (2) formation of conidia (macro- and micro-) which can be dispersed and then germinate to produce new mycelium. In the sexual cycle, mating can only occur between individual strains of different mating type, A and a. Fertilization occurs by the passage of nuclei of conidia or mycelium of one mating type into the protoperithecia of the opposite mating type through the trichogyne. Fusion of the nuclei of opposite mating types occurs within the protoperithecium to form a zygote (2N) nucleus. (from Mating in fungi)
Image 44Common puffball (Lycoperdon perlatum) has a glebal hymenium; the interior is white when it is young, but as it matures, the interior becomes brown containing spores (from Mushroom)
Image 45Morphological diversity of fungi collected from a marine sponge species, Ircinia variabilis (from Marine fungi)
Image 46Young Amanita phalloides "death cap" mushrooms, with a matchbox for size comparison (from Mushroom)