Bolete

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The porcini, Boletus edulis, showing the solid looking, spongy bottom surface, which is the defining characteristic of boletes. Boletus edulis EtgHollande 041031 091.jpg
The porcini, Boletus edulis, showing the solid looking, spongy bottom surface, which is the defining characteristic of boletes.

A bolete is a type of mushroom, or fungal fruiting body. It can be identified thanks to a unique cap. On the underside of the cap there is usually a spongy surface with pores, instead of the gills typical of mushrooms. A similar pore surface is found in polypores, but these species generally have a different physical structure from boletes, and have different microscopic characteristics than boletes. Many polypores have much firmer, often woody, flesh.

Contents

"Bolete" is the English common name for fungus species with caps that have this appearance.

Some, but not all boletes bruise blue. [1]

Taxonomy

The boletes are classified in the order Boletales. However, not all members of the order Boletales are boletes. The micromorphology and molecular phylogeny of the order Boletales have established that it also contains many gilled, puffball, and other fruit body shapes. Examples of these fungi include Croogomphus, Gomphidius , Phylloporus , Paxillus, Tapinella, Hygrophoropsis , [2] and Scleroderma. [3]

Pseudoboletus parasiticus is a parasite to Scleroderma citrinum. Parasitic Bolete - Pseudoboletus parasiticus (24094342608).jpg
Pseudoboletus parasiticus is a parasite to Scleroderma citrinum.

The genus Boletus was originally broadly defined and described by Carl Linnaeus in 1753, containing all pored mushrooms. [4] Since then, gradually other genera have been defined, such as Tylopilus by Karsten in 1881 [5] , and old names such as Leccinum and Suillus resurrected or redefined.

Recently, the genus Boletus has been split up even more, creating new genera, such as Xerocomellus [6] and Caloboletus . [7]

Ecology

Most boletes are mycorrhizal and are generally found in woodlands. [8] There is also a parasitic bolete, Pseudoboletus parasiticus , which grows on Scleroderma citrinum. [9] [10] Another parasitic bolete is Buchwaldoboletus lignicola , which is a parasite to Phaeolus schweinitzii , the dyer's polypore. [11]

Satan's bolete (Rubroboletus satanas) is a very poisonous mushroom. Satans-Rohrling Boletus satanas.jpg
Satan's bolete (Rubroboletus satanas) is a very poisonous mushroom.

Boletes are susceptible to infection by the fungus Hypomyces chrysospermus , also known as the bolete eater. [12] [13]

Xerocomellus boletes are edible, but not highly prized. Xerocomellus.jpg
Xerocomellus boletes are edible, but not highly prized.

Edibility

Many boletes, such as the porcini (Boletus edulis), are edible and considered a delicacy. [13] However, other boletes, such as Suillus and Xerocomellus are considered edible, but not choice. [13] [14] Some boletes, such as Caloboletus and Tylopilus are too bitter to eat. [13] [2] Other boletes, such as ones in the Rubroboletus genus, such as Satan's bolete ( Rubroboletus satanas ) are dangerously poisonous. [2] Most poisonous boletes have red pores. [15]

Related Research Articles

<span class="mw-page-title-main">Boletales</span> Order of fungi

The Boletales are an order of Agaricomycetes containing over 1300 species with a diverse array of fruiting body types. The boletes are the best known members of this group, and until recently, the Boletales were thought to only contain boletes. The Boletales are now known to contain distinct groups of agarics, puffballs, and other fruiting-body types.

<span class="mw-page-title-main">Boletaceae</span> Family of fungi

The Boletaceae are a family of mushroom-forming fungi, primarily characterised by small pores on the spore-bearing hymenial surface, instead of gills as are found in most agarics. Nearly as widely distributed as the agarics, the family is renowned for hosting some prime edible species highly sought after by mushroom hunters worldwide, such as the cep or king bolete . A number of rare or threatened species are also present in the family, that have become the focus of increasing conservation concerns. As a whole, the typical members of the family are commonly known as boletes.

<i>Rubroboletus satanas</i> Species of fungus

Rubroboletus satanas, commonly known as Satan's bolete or the Devil's bolete, is a basidiomycete fungus of the bolete family (Boletaceae) and one of its most infamous members. It was known as Boletus satanas before its transfer to the new genus Rubroboletus in 2014, based on molecular phylogenetic data. Found in broad-leaved and mixed woodland in the warmer regions of Europe, it is classified as a poisonous mushroom, known to cause violent gastroenteritis. However, reports of poisoning are rare, due to the striking coloration and unpleasant odor of the fruiting bodies, which discourage experimentation.

<i>Boletus</i> Genus of fungus

Boletus is a genus of mushroom-producing fungi, comprising over 100 species. The genus Boletus was originally broadly defined and described by Carl Linnaeus in 1753, essentially containing all fungi with hymenial pores instead of gills. Since then, other genera have been defined gradually, such as Tylopilus by Petter Adolf Karsten in 1881, and old names such as Leccinum have been resurrected or redefined. Some mushrooms listed in older books as members of the genus have now been placed in separate genera. These include such as Boletus scaber, now Leccinum scabrum, Tylopilus felleus, Chalciporus piperatus and Suillus luteus. Most boletes have been found to be ectomycorrhizal fungi, which means that they form a mutualistic relationship with the roots system of certain kinds of plants. More recently, Boletus has been found to be massively polyphyletic, with only a small percentage of the over 300 species that have been assigned to Boletus actually belonging there and necessitating the description and resurrection of many more genera.

<i>Caloboletus calopus</i> Species of fungus in the family Boletaceae found in Asia, Northern Europe and North America

Caloboletus calopus, commonly known as the bitter bolete, bitter beech bolete or scarlet-stemmed bolete, is a fungus of the bolete family, found in Asia, Northern Europe and North America. Appearing in coniferous and deciduous woodland in summer and autumn, the stout fruit bodies are attractively coloured, with a beige to olive cap up to 15 cm (6 in) across, yellow pores, and a reddish stipe up to 15 cm (6 in) long and 5 cm (2 in) wide. The pale yellow flesh stains blue when broken or bruised.

<i>Tylopilus felleus</i> Species of fungus

Tylopilus felleus, commonly known as the bitter bolete or the bitter tylopilus, is a fungus of the bolete family. Its distribution includes east Asia, Europe and eastern North America, extending south into Mexico and Central America. A mycorrhizal species, it grows in deciduous and coniferous woodland, often fruiting under beech and oak. Its fruit bodies have convex to flat caps that are some shade of brown, buff or tan and typically measure up to 15 cm (6 in) in diameter. The pore surface is initially white before turning pinkish with age. Like most boletes it lacks a ring and it may be distinguished from Boletus edulis and other similar species by its unusual pink pores and the prominent dark-brown net-like pattern on its stalk.

<i>Chalciporus piperatus</i> Species of fungus in the family Boletaceae found in mixed woodland in Europe and North America

Chalciporus piperatus, commonly known as the peppery bolete, is a small pored mushroom of the family Boletaceae found in mixed woodland in Europe and North America. It has been recorded under introduced trees in Brazil, and has become naturalised in Tasmania and spread under native Nothofagus cunninghamii trees. A small bolete, the fruit body has a 1.6–9 cm orange-fawn cap with cinnamon to brown pores underneath, and a 4–9.5 cm high by 0.6–1.2 cm thick stipe. The flesh has a very peppery taste. The rare variety hypochryseus, found only in Europe, has yellow pores and tubes.

<i>Neoboletus luridiformis</i> Species of fungus

Neoboletus luridiformis, also previously known as Boletus luridiformis and (invalidly) as Boletus erythropus, is a fungus of the bolete family, all of which produce mushrooms with tubes and pores beneath their caps. It is found in Northern Europe and North America, and is commonly known as the scarletina bolete, for its red pores, which are yellow when young. Other common names include the red foot bolete, dotted stemmed bolete, or dotted stem bolete.

<i>Hypomyces</i> Genus of fungi

Hypomyces is a genus of parasitic ascomycete fungi found in Europe, North America, Australia, and parts of China. The genus contains 53 species. Better known species include the lobster mushroom and the bolete eater.

<i>Chalciporus</i> Genus of fungi

Chalciporus is a genus of fungi in the family Boletaceae. There are approximately 25 species in the genus.

<i>Aureoboletus mirabilis</i> Species of fungus

Aureoboletus mirabilis, commonly known as the admirable bolete, the bragger's bolete, and the velvet top, is an edible species of fungus in the Boletaceae mushroom family. The fruit body has several characteristics with which it may be identified: a dark reddish-brown cap; yellow to greenish-yellow pores on the undersurface of the cap; and a reddish-brown stem with long narrow reticulations. Aureoboletus mirabilis is found in coniferous forests along the Pacific Coast of North America, and in Asia. Unusual for boletes, A. mirabilis sometimes appears to fruit on the wood or woody debris of Hemlock trees, suggesting a saprobic lifestyle. Despite the occasional appearances to the contrary, Aureoboletus mirabilis is mycorrhizal, and forms a close association with the tree's roots.

<i>Hypomyces chrysospermus</i> Fungal parasite of bolete mushrooms

Hypomyces chrysospermus, the bolete eater, is a parasitic ascomycete fungus that grows on bolete mushrooms, turning the afflicted host a whitish, golden yellow, or tan color. It is found in Eurasia and North America, as well as southwest Western Australia.

<i>Rubroboletus rhodoxanthus</i> Species of fungus

Rubroboletus rhodoxanthus is a species of bolete in the family Boletaceae, native to Europe. Previously known as Boletus rhodoxanthus, it was transferred in 2014 to the newly erected genus Rubroboletus, based on DNA data.

<i>Pseudoboletus parasiticus</i> Species of fungus

Pseudoboletus parasiticus, previously known as Boletus parasiticus and Xerocomus parasiticus, and commonly known as the parasitic bolete, is a rare bolete mushroom found on earthballs. Pseudoboletus parasiticus is one of the earliest-diverging lineages of the Boletaceae, after the clade comprising Chalciporus and Buchwaldoboletus.

<i>Xerocomellus</i> Genus of fungi

Xerocomellus is a genus of fungi in the family Boletaceae. The genus, as it was described in 2008, contained 12 species. However X. rubellus and X. engelii were transferred to the new genus Hortiboletus and X. armeniacus was transferred to the new genus Rheubarbariboletus in 2015. Molecular analysis supports the distinction of Xerocomellus species from Boletus and Xerocomus, within which these species were formerly contained. Xerocomellus in fact is only distantly related to Xerocomus and is most closely related to Tylopilus, Boletus sensu stricto, Porphyrellus, Strobilomyces, and Xanthoconium.

<i>Buchwaldoboletus lignicola</i> Species of fungus

Buchwaldoboletus lignicola is a species of bolete fungus in the family Boletaceae native to Europe and North America. Found on wood, it is actually parasitic on the fungus Phaeolus schweinitzii. It has a convex yellow- to rusty brown cap, yellow to yellow-brown pores and stipe, and a brown spore print. Its edibility is unknown.

<i>Aureoboletus betula</i> Species of fungus

Aureoboletus betula is a species of mushroom producing fungus in the family Boletaceae. It is commonly known as the shaggy stalked bolete.

<i>Xerocomellus dryophilus</i> Species of fungus

Xerocomellus dryophilus, commonly known as the oak-loving bolete and formerly known as Boletus dryophilus or Xerocomus dryophilus, is a basidiomycete fungus in the family Boletaceae native to North America. It appears to only occur under the coast live oak, and is only found in California, where it is one of the most common boletes in the Los Angeles and San Diego counties.

<i>Caloboletus marshii</i> Species of mushroom

Caloboletus marshii, commonly known as Ben's bitter bolete, is a species of mushroom in the family Boletaceae. It is not poisonous, but it is too bitter to eat. It turns blue when cut or bruised, and it grows under live oak.

References

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  11. Initiative, The Global Fungal Red List. "Buchwaldoboletus lignicola". redlist.info. Retrieved 2024-07-15.
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