Omphalotus olivascens

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Omphalotus olivascens
Omphalotus olivascens 125218.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Omphalotaceae
Genus: Omphalotus
Species:
O. olivascens
Binomial name
Omphalotus olivascens
Omphalotus olivascens
Information icon.svg
Gills icon.png Gills on hymenium
Infundibuliform cap icon.svg Cap is infundibuliform
Decurrent gills icon2.svg Hymenium is decurrent
Bare stipe icon.svg Stipe is bare
Transparent spore print icon.svg
Spore print is yellow
Saprotrophic fungus.svgEcology is saprotrophic
Mycomorphbox Poison.pngEdibility is poisonous

Omphalotus olivascens, commonly known as the western jack-o'-lantern mushroom, is an orange to brown-colored gilled poisonous mushroom endemic to the California_Floristic_Province. It is sometimes mistaken for chanterelles. [1]

Contents

Taxonomy

The fungus was described as new to science in 1976 by American mycologists Howard E. Bigelow, Orson K. Miller Jr., and Harry D. Thiers. [2] A subspecies with blue flesh, O. olivascens var. indigo, was described growing on live oak in Baja California, Mexico. [3]

Description

To an untrained eye, O. olivascens appears similar to some chanterelles, but unlike the chanterelle, the jack-o'-lantern mushroom has true, blade-like [4] gills (rather than ridges) and it can have olive coloration that chanterelles lack; also, Omphalotus species are saprotrophic, grow directly on wood, and are bioluminescent. [5]

The cap is 4–18 cm (1.6–7.1 in) wide. The stalks are 4–15 cm (1.6–5.9 in) long and 1–4 cm (0.39–1.57 in) wide. The spores are white to pale yellow. [6]

Ecology

A saprobe or parasite, O. olivascens is usually found on oak or Eucalpytus, rarely on other hosts.

Omphalotus species cause a white rot by breaking down lignin in their tree hosts. [7]

Biochemistry

The jack o'lantern mushroom is poisonous; while not lethal, consuming this mushroom leads to very severe cramps, vomiting, and diarrhea. [5]

The toxic ingredient of many species of Omphalotus is a sesquiterpene compound known as illudin S. [8] This, along with illudin M, have been identified in O. nidiformis. The two illudins are common to the genus Omphalotus and not found in any other basidiomycete mushroom. [9]

Similar species

Several Omphalotus species with similar bioluminescent properties occur worldwide, all of which are presumed poisonous. The best known are the North American jack o'lantern mushroom ( O. olearius ) and the tsukiyotake ( O. japonicus (Kawam.) Kirchm. & O.K. Mill. (formerly known as Lampteromyces japonicus (Kawam.) Sing.), found in Japan and eastern Asia. Molecular analysis shows the jack-o'-lantern to be most closely related to the ghost fungus Omphalotus nidiformis . [7] Miller notes that the colours and shades of the ghost fungus most closely resemble this species. [10]

Gymnopilus junonius is another similar-looking species. [6]

See also

Related Research Articles

<span class="mw-page-title-main">Chanterelle</span> Common name of several species of fungi

Chanterelle is the common name of several species of fungi in the genera Cantharellus, Craterellus, Gomphus, and Polyozellus. They are among the most popular of wild edible mushrooms. They are orange, yellow or white, meaty and funnel-shaped. On the lower surface, underneath the smooth cap, most species have rounded, forked folds that run almost all the way down the stipe, which tapers down seamlessly from the cap. Many species emit a fruity aroma, reminiscent of apricots, and often have a mildly peppery taste. The name chanterelle originates from the Greek kantharos meaning "tankard" or "cup", a reference to their general shape.

<i>Cantharellus</i> Genus of fungi

Cantharellus is a genus of mushrooms, commonly known as chanterelles, a name which can also refer to the type species, Cantharellus cibarius. They are mycorrhizal fungi, meaning they form symbiotic associations with plants. Chanterelles may resemble a number of other species, some of which are poisonous.

<i>Omphalotus olearius</i> Species of fungus

Omphalotus olearius, commonly known as the jack-o'-lantern mushroom, is a poisonous orange gilled mushroom that to an untrained eye appears similar to some chanterelles. It is notable for its bioluminescent properties. It is found in woodland areas in Europe, where it grows on decaying stumps, on buried roots or at the base of hardwood trees. It has also been reported from the Western Cape Province, South Africa. A similar, but phylogenetically distinct species found in eastern North America is Omphalotus illudens.

<i>Omphalotus illudens</i> Species of fungus

Omphalotus illudens, commonly known as the eastern jack-o'lantern mushroom, is a large, orange mushroom that is often found in clumps on decaying stumps, buried roots, or at the base of hardwood trees in eastern North America. Its gills often exhibit a weak green bioluminescence when fresh. This green glow has been mentioned in several journal articles, which state that the phenomenon can persist up to 40–50 hours after the mushroom has been picked. It is believed that this display serves to attract insects to the mushroom's gills during nighttime, which can then distribute its spores across a wider area.

The illudins are a family of sesquiterpenes with antitumor antibiotic properties produced by some mushrooms. In their isolated form, illudins show selective toxicity for myelocytic leukemia and other carcinoma cells.

<i>Clitocybe</i> Genus of fungi

Clitocybe is a genus of mushrooms characterized by white, off-white, buff, cream, pink, or light-yellow spores, gills running down the stem, and pale white to brown or lilac coloration. They are primarily saprotrophic, decomposing forest ground litter. There are estimated to be around 300 species in the widespread genus.

<i>Hygrophoropsis aurantiaca</i> Species of fungus in the family Hygrophoropsidaceae

Hygrophoropsis aurantiaca, commonly known as the false chanterelle, is a species of fungus in the family Hygrophoropsidaceae. It is found across several continents, growing in woodland and heathland, and sometimes on woodchips used in gardening and landscaping. Fruit bodies (mushrooms) are yellow–orange, with a funnel-shaped cap up to 8 cm across that has a felt-like surface. The thin, often forked gills on the underside of the cap run partway down the length of the otherwise smooth stipe. Reports on the mushroom's edibility vary – it is considered poisonous, but has historically been eaten in parts of Europe and the Americas.

<i>Omphalotus</i> Genus of fungi

Omphalotus is a genus of basidiomycete mushroom, in the family Omphalotaceae, formally circumscribed by Victor Fayod in 1889. Members have the traditional cap and stem structure. They are saprobic, and fruit in clumps on the ground, adjacent to host trees. The best known and type species is the jack-o'-lantern mushroom (Omphalotus olearius). Species of Omphalotus have been mistaken for chanterelles. All Omphalotus species are presumed poisonous, causing gastrointestinal symptoms. Some Omphalotus species have bioluminescent properties.

<i>Omphalotus nidiformis</i> Species of bioluminescent fungus in the family Marasmiaceae

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.

<span class="mw-page-title-main">Orson K. Miller Jr.</span> American mycologist

Orson Knapp Miller Jr. was an American mycologist. He published numerous papers in mycology and was responsible for the naming of many taxa, as well as being one of the authors erecting the genus Chroogomphus. He described Omphalotus olivascens, several species of Amanita, and the ghoul fungus Hebeloma aminophilum.

<span class="mw-page-title-main">Alexander H. Smith</span> American mycologist (1904-1986)

Alexander Hanchett Smith was an American mycologist known for his extensive contributions to the taxonomy and phylogeny of the higher fungi, especially the agarics.

<i>Cantharellus lateritius</i> Species of fungus

Cantharellus lateritius, commonly known as the smooth chanterelle, is a species of edible fungus in the mushroom family Cantharellaceae. An ectomycorrhizal species, it is found in Asia, Africa, and North America. The species has a complex taxonomic history, and has undergone several name changes since its first description by American mycologist Lewis David de Schweinitz in 1822. The fruit bodies of the fungus are brightly colored yellow to orange, and usually highly conspicuous against the soil in which they are found. At maturity, the mushroom resembles a filled funnel with the spore-bearing surface along the sloping outer sides. The texture of the fertile undersurface (hymenium) of the caps is a distinguishing characteristic of the species: unlike the well-known golden chanterelle, the hymenium of C. lateritius is much smoother. Chemical analysis has revealed the presence of several carotenoid compounds in the fruit bodies.

<i>Cantharellus formosus</i> Species of fungus

Cantharellus formosus, commonly known as the Pacific golden chanterelle, is a fungus native to the Pacific Northwest region of North America. It is a member of the genus Cantharellus along with other popular edible chanterelles. It was distinguished from the similar C. cibarius of Europe in the 1990s. It is orange to yellow, meaty and funnel-shaped. On the underside of the smooth cap, it has gill-like ridges that run down onto its stipe, which tapers down seamlessly from the cap. The false gills often have a pinkish hue. It has a mild, sweet odor. It is solitary to gregarious in coniferous forests, fruiting from July to December.

<i>Cantharellus californicus</i> Species of fungus

Cantharellus californicus, also called the California golden chanterelle, mud puppy, or oak chanterelle, is a fungus native to California, United States. It is a member of the genus Cantharellus along with other popular edible chanterelles. It is generally similar in appearance to C. cibarius and C. formosus except for its large size at maturity; individual specimens larger than 1 kilogram (2.2 lb), or greater, are reported, making it the largest known species of chanterelle. Their unusual size is due in part to their capacity for indeterminate growth, making Cantharellus californicus specimens actively grow for far longer than most other mushrooms. It became the official state mushroom of California in 2024.

Jack o' lantern mushroom is a common name for several fungus species in the genus Omphalotus:

<i>Omphalotus subilludens</i> Species of fungus

Omphalotus subilludens, commonly known as the Southern Jack O'lantern mushroom, is a basidiomycete fungi in the genus Omphalotus. It has been definitively recorded in Florida and Texas with reports of species in Arizona and Mexico. It fruits on dead and dying trees during warmer parts of the year, producing a fairly large orange to brown-orange fruiting body that occurs in clusters. It is most closely related to O. olivascans, O. olearius, and O. japonicus and has high cross compatibility with O. olivescans and O. olearis. It is poisonous to humans and animals when eaten but rarely produces life-threatening symptoms, usually poisonings are resolved in 24-48 hours, with the majority of symptoms being gastrointestinal. Compounds in these mushrooms have pharmacological potential with potential applications in anti-coagulants, cancer therapies, and antibiotics. It is also bioluminescent producing a faint glow around the gills through the oxidation of luciferase.

Omphalotus mangensis is a species of agaric fungus in the family Marasmiaceae. Found in China, the fruit bodies of the fungus are bioluminescent.

<i>Omphalotus japonicus</i> Species of fungus

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.

References

  1. Thiers, Harry D.; Arora, David (September 1980). "Mushrooms Demystified". Mycologia. 72 (5): 1054. doi:10.2307/3759750. ISSN   0027-5514.
  2. Bigelow HE, Miller OK Jr, Thiers HD (1976). "A new species of Omphalotus". Mycotaxon. 3 (3): 363–372.
  3. Moreno G, Esteve-Raventós F, Pöder R, Ayala N (1993). "Omphalotus olivascens var. indigo, var. nov. from Baja California (Mexico)". Mycotaxon. 48: 217–22.
  4. Meuninck, Jim (2017). Foraging Mushrooms Oregon: Finding, Identifying, and Preparing Edible Wild Mushrooms. Falcon Guides. p. 4. ISBN   978-1-4930-2669-2.
  5. 1 2 Michael Wood & Fred Stevens. "Omphalotus olivascens". California Fungi. Retrieved 2011-03-25.
  6. 1 2 Davis, R. Michael; Sommer, Robert; Menge, John A. (2012). Field Guide to Mushrooms of Western North America. Berkeley: University of California Press. pp. 143–144. ISBN   978-0-520-95360-4. OCLC   797915861.
  7. 1 2 Kirchmair M, Morandell S, Stolz D, Pöder R (2004). "Phylogeny of the genus Omphalotus based on nuclear ribosomal DNA-sequences". Mycologia. 96 (6): 1253–1260. doi:10.2307/3762142. JSTOR   3762142. PMID   21148949.
  8. Benjamin DR (1995). Mushrooms: Poisons and Panaceas — A Handbook for Naturalists, Mycologists and Physicians. New York, New York: WH Freeman and Company. pp. 366–67. ISBN   0-7167-2600-9.
  9. Kirchmair, Martin (1999). "Identification of illudins in Omphalotus nidiformis and Omphalotus olivascens var. indigo by column liquid chromatography–atmospheric pressure chemical ionization tandem mass spectrometry". Journal of Chromatography A. 832 (1–2): 247–52. doi:10.1016/s0021-9673(98)00892-9. ISSN   0021-9673. PMID   10070774.
  10. Miller OK. Jr. (1994). "Observations on the genus Omphalotus in Australia". Mycologia Helvetica. 6 (2): 91–100.