Tylopilus felleus

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Tylopilus felleus
2006-09-14 Tylopilus felleus crop.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Boletales
Family: Boletaceae
Genus: Tylopilus
Species:
T. felleus
Binomial name
Tylopilus felleus
(Bull.) P.Karst. (1881)
Synonyms [1] [2]
  • Boletus felleus Bull. (1788)
  • Boletus alutarius Fr. (1815)
  • Boletus alutarius Rostk. (1844)
  • Tylopilus felleus var. alutarius(Fr.) P.Karst. (1882)
  • Dictyopus felleus(Fr.) Quél. (1886)
  • Rhodoporus felleus(Fr.) Quél. (1888)
  • Tylopilus alutarius(Fr.) Henn. (1898)
  • Boletus felleus var. minor Coker & Beers (1943)
  • Tylopilus felleus var. uliginosus A.H.Sm. & Thiers (1971)
  • Tylopilus felleus var. minor(Coker & Beers) Pilát & Dermek (1974)
Tylopilus felleus
Information icon.svg
Pores icon.pngPores on hymenium
Convex cap icon.svg Cap is convex
Adnate gills icon2.svg Hymenium is adnate
Bare stipe icon.svg Stipe is bare
Transparent spore print icon.svg
Transparent spore print icon.svg
 Spore print is buff to pink
Mycorrhizal fungus.svgEcology is mycorrhizal
Mycomorphbox Inedible.pngEdibility is inedible

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.

Contents

French mycologist Pierre Bulliard described this species as Boletus felleus in 1788 before it was transferred into the new genus Tylopilus . It is the type species of Tylopilus and the only member of the genus found in Europe. Tylopilus felleus has been the subject of research into bioactive compounds that have been tested for antitumour and antibiotic properties. Although not poisonous it is generally considered inedible owing to its overwhelming bitterness.

Taxonomy

The species was first described in the scientific literature as le bolet chicotin (Boletus felleus) by French mycologist Pierre Bulliard in 1788. [3] As the large genus Boletus was carved up into smaller genera, Petter Karsten transferred it in 1881 to Tylopilus , [4] a genus diagnosed by its pink spores and adnate tubes. [5] Tylopilus felleus is the type species of Tylopilus and the only member of the genus found in Europe. Synonyms include Boletus alutarius, described by Elias Magnus Fries in 1815 [6] and later by Friedrich Wilhelm Gottlieb Rostkovius in 1844, and Paul Christoph Hennings's subsequent transfer of Fries's taxon into Tylopilus, T. alutarius. [1] [7] Lucien Quélet placed the taxon in Dictyopus in 1886 and then Rhodoporus in 1888, [2] but neither of these genera are recognised today, the former having been merged into Boletus and the latter into Tylopilus. [8] Genetic analysis published in 2013 shows that T. felleus and many (but not all) other members of Tylopilus form a Tylopilus clade within a larger group informally called anaxoboletus in the Boletineae. Other clades in the group include the porcini and Strobilomyces clades as well as three other groups composed of members of various genera including Xerocomus , Xerocomellus and Boletus badius and relatives. [9]

A variety described from the Great Lakes region, var. uliginosus, was recognised by Alexander H. Smith and Harry D. Thiers in 1971 on the basis of its microscopic features, [2] a distinction supported by Professor C.B. Wolfe of Pennsylvania State University. [10] However Index Fungorum does not consider this an independent taxon. [1] Similarly, Boletus felleus var. minor, published originally by William Chambers Coker and A.H. Beers in 1943 [11] (later transferred to Tylopilus by Albert Pilát and Aurel Dermek in 1974), [12] has been folded into synonymy with T. felleus. [1] Charles Horton Peck described Boletus felleus var. obesus in 1889, [13] but no record of a type specimen exists. [14] Although some records exist of T. felleus in Australia, their spores are of consistently smaller dimensions and this taxon has been classified as a separate species, T. brevisporus . [15]

Tylopilus felleus derives its genus name from the Greek tylos "bump" and pilos "hat" and its specific name from the Latin fel meaning "bile", referring to its bitter taste, similar to bile. [5] The mushroom is commonly known as the "bitter bolete" [16] or the "bitter tylopilus". [17]

Description

2012-06-09 Tylopilus felleus (Bull.) P. Karst 226780 crop.jpg
The tubes, initially white when young, become dirty pink in maturity.
2012-06-09 Tylopilus felleus (Bull.) P. Karst 226777.jpg
Coarse brown reticulation is characteristic of the stalk surface.

The cap of this species grows up to 15 cm (6 in) in diameter, [5] though some North American specimens reach 30 cm (12 in) across. [2] Grey-yellow to pale- or walnut-brown, it is slightly downy at first and later becomes smooth with a matte lustre. It is initially convex before flattening out with maturity. [5] The cap skin does not peel away from the flesh. [18] The pores underneath are white at first and become pinkish with maturity. They are adnate to the stalk and bulge downwards as the mushroom ages. [19] The pores bruise carmine or brownish, [20] often developing rusty-brown spots with age, [21] and number about one or two per millimetre. [16] The tubes are long relative to the size of the cap, measuring 2–3 cm (0.8–1.2 in) deep in the middle part of the cap. [21] The stalk is initially bulbous before stretching and thinning in the upper part; the lower part of the stalk remains swollen, sometimes shrinking at the base where it attaches to the substrate. [21] It measures 7–10 cm (2.8–3.9 in)—rarely to 20 cm (7.9 in) [2] —tall, and 2–3 cm (0.8–1.2 in) wide, and can bulge out to 6 cm (2.4 in) across at the base. [19] It is lighter in colour than the cap, and covered with a coarse brown network of markings, [19] which have been likened to fishnet stockings in appearance. [20] Described as "very appetising" in appearance, [22] the flesh is white or creamy, and pink beneath the cap cuticle; the flesh can also develop pinkish tones where it has been cut. [23] It has a slight smell, [18] which has been described as pleasant, [5] [24] as well as faintly unpleasant. [19] [20] The flesh is softer than that of other boletes, [20] and tends to become more spongy as the mushroom matures. [21] Insects rarely infest this species. [18]

Spores seen with light microscopy 2012-06-09 Tylopilus felleus (Bull.) P. Karst 226782 crop.jpg
Spores seen with light microscopy

The colour of the spore print is brownish, with pink, reddish, or rosy tints. Spores are somewhat fuse-shaped, smooth, and measure 11–17 by 3–5  µm. [16] The basidia (spore-bearing cells) are club-shaped, four-spored, and measure 18–25.6 by 7.0–10.2 µm. Cystidia on the walls of the tubes (pleurocystidia) are fuse-shaped with a central swelling, thin-walled, and have granular contents. They possess sharp to tapered tips, and have overall dimensions of 36–44 by 8.0–11.0 µm. On the pore edges, the cheilocystidia are similar in shape to the pleurocystidia, measuring 24.8–44.0 by 7.3–11.0 µm. [17] The hymenium of Smith and Thiers's variety uliginosus, when mounted in Melzer's reagent, shows reddish globules of pigment measuring 2–8 µm that appear in the hyphae and throughout the hymenium, and a large (8–12 µm) globule in the pleurocystidia. [2]

Several chemical tests have been documented that can help confirm the identify of this species. On the cap flesh, application of formaldehyde turns the tissue pinkish, iron salts result in a colour change to greyish-green, aniline causes a lavender to reddish-brown colour, and phenol a purplish pink to reddish brown. On the cap cuticle, nitric acid causes an orange-salmon colour, sulphuric acid creates orange-red, ammonia usually makes brown, and a potassium hydroxide solution usually makes orange. [25]

Similar species

Boletus edulis 11.jpg
Boletus edulis
Tylopilus rubrobrunneus 89304.jpg
Tylopilus rubrobrunneus

Italian cook and author Antonio Carluccio reports this is one of the most common fungi brought to him to identify, having been mistaken for an edible species. [26] Young specimens can be confused with many edible boletes, though as the pores become more pink the species becomes easier to identify. Some guidebooks advocate tasting the flesh, the smallest piece of which will be very bitter. [20] The dark-on-light reticulation in the stalk is distinctive and is the opposite colouration to that on the stalk of the prized Boletus edulis . [26] T. felleus is found in the same habitat as B. badius, though the latter's yellow tubes and blue-bruising flesh easily distinguish these very dissimilar species. B. subtomentosus may have a similar-coloured cap but its yellow pores and slender stalk aid identification. [22]

Tylopilus rubrobrunneus , found in hardwood forests of eastern North America, is similar in appearance to T. felleus but has a purplish to purple-brown cap. [23] It is also inedible owing to its bitter taste. [17] Another North American species, T. variobrunneus , has a cap that is reddish-brown to chestnut-brown, with olive tones in youth. It has shorter spores than T. felleus, typically measuring 9–13 by 3–4.5  μm. In the field it can be distinguished from the latter species by its mild to slightly bitter taste. [27] T. rhoadsiae , found in the southeastern United States, has a lighter-coloured cap which is smaller, up to 9 cm (3.5 in) in diameter. [28] The edible T. indecisus and T. ferrugineus can be confused with T. felleus but have less reticulated stalks. [2] The dimensions of the spores of the Australian species T. brevisporus range from 9.2 to 10.5 by 3.5 to 3.9 μm. [15] T. neofelleus , limited in distribution to deciduous forests of China, New Guinea, Japan and Taiwan, can be distinguished from T. felleus macroscopically by its vinaceous-brown cap and pinkish-brown to vinaceous stalk and microscopically by its smaller spores (measuring 11–14 by 4–5 μm) and longer pleurocystidia (49–107 by 14–24 μm). [29]

Ecology, distribution and habitat

In maturity, the pores often bruise brownish, while the pore surface bulges downward. Gemeine Gallenrohrling Tylopilus felleus.jpg
In maturity, the pores often bruise brownish, while the pore surface bulges downward.

Like all Tylopilus species, T. felleus is mycorrhizal. [30] It is found in deciduous and coniferous woodland, often under beech and oak [23] in well-drained acid soils, [31] which can be sandy, gravelly or peaty. [22] If encountered on calcareous (chalky) soil, it will be in moist areas that have become waterlogged and have ample leaf litter. [5] Fruit bodies grow singly or in small groups, and occasionally in small clusters with two or three joined at the base of the stem. [21] Fruit bodies have also been growing in the cavities of old trees, [21] on old conifer stumps, or on buried rotten wood. [30] The fungus obtains most of its nitrogen requirements from amino acids derived from the breakdown of proteins, although a lesser amount is obtained from the amino sugar glucosamine (a breakdown product of chitin, a major component of fungal cell walls). The mycorrhizal plant partner benefits from the fungus's ability to use these forms of nitrogen, which are often abundant in the forest floor. [32] Fruit bodies appear over summer and autumn, anytime from June to October or even November, in many of the northern temperate zones. [16] [18] Large numbers may appear in some years and none in others, [22] generally proportional to the amount of rainfall. [18] Variety uliginosus, known from Michigan, grows among lichens and mosses under pines. [2]

In North America it is known from eastern Canada, south to Florida and west to Minnesota in the United States [16] and into Mexico and Central America. [23] Its European distribution is widespread; it is relatively common in many regions but rare or almost absent in others. [21] In Asia it has been recorded from the vicinity of Dashkin in the Astore District of northern Pakistan [33] and as far east as China, where it has been recorded from Hebei, Jiangsu, Fujian, Guangdong and Sichuan provinces, [34] and Korea. [35]

The strong taste of the fruit body may have some role in insects avoiding it. [36] The small fly species Megaselia pygmaeoides feeds on and infests the fruit bodies of T. felleus in North America though it seems to prefer other boletes in Europe. [36] Fruit bodies can be parasitized by the mould Sepedonium ampullosporum . [37] Infection results in necrosis of the mushroom tissue and a yellow colour caused by the formation of large amounts of pigmented aleurioconidia (single-celled conidia produced by extrusion from the conidiophores). [38]

The bacterium Paenibacillus tylopili has been isolated from the mycorrhizosphere of T. felleus; this is the region around its subterranean hyphae where nutrients released from the fungus affect the activity of the microbial population in the soil. The bacterium excretes enzymes that allow it to break down the biomolecule chitin. [39]

Fruit bodies of T. felleus have a high capacity to accumulate radioactive caesium (137Cs) from contaminated soil, a characteristic attributed to the deep soil penetration achieved by the mycelium. [40] In contrast the species has a limited capacity to accumulate the radioactive isotope 210Po. [41]

Edibility

Even when cooking, it smells terrific, but one taste of the Bitter Bolete would not only disappoint but perhaps depress the novice mushroom hunter.

Edible Wild Mushrooms of North America:
A Field-To-Kitchen Guide [42]

As its common name suggests, it is extremely bitter, though not toxic as such. This bitterness is worsened by cooking. [20] One specimen can foul the taste of a whole meal prepared with mushrooms. [18] Despite this it is sold in markets ( tianguis ) in Mexico. [43] [44] A local recipe from France, Romania and East Germany calls for stewing it in skimmed milk, after which it can be eaten or powdered and used for flavouring. [18] The mushroom is not bitter for those who lack genetic sensitivity to bitter taste, [16] a trait endowed by the gene TAS2R38 (taste receptor 2 member 38). [45] The compound responsible for the bitter taste has not been identified. [46]

Research

The mycelium of Tylopilus felleus can be grown in axenic culture, on agar containing growth medium. The fungus can form fruit bodies if the temperature is suitable and the light conditions simulate a 12-hour day. The mushrooms are usually deformed, often lacking stalks so that the cap grows on the surface direct and the caps are usually 0.5–1.0 cm (0.2–0.4 in) in diameter. There are few Boletaceae species known to fruit in culture since ectomycorrhizal fungi tend to not fruit when separated from their host plant. [47]

Compounds from T. felleus have been extracted and researched for potential medical uses. [20] Tylopilan is a beta-glucan that was isolated from the fruit bodies in 1988 and shown in laboratory tests to have cytotoxic properties [48] and to stimulate non-specific immunological response. In particular it enhances phagocytosis, the process by which macrophages and granulocytes engulf and digest foreign bacteria. [49] In experiments on mice with tumour cells it appeared to have antitumour effects when administered in combination with a preparation of Cutibacterium acnes in a 1994 Polish study. [50] Researchers in 2004 reported that extracts of the fruit body inhibit the enzyme pancreatic lipase; it was the second most inhibitory of 100 mushrooms they tested. A compound present in the mushroom, N-γ-glutamyl boletine, has mild antibacterial activity. [51]

See also

Related Research Articles

<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>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 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</i> Genus of fungi

Tylopilus is a genus of over 100 species of mycorrhizal bolete fungi separated from Boletus. Its best known member is the bitter bolete, the only species found in Europe. More species are found in North America, such as the edible species T. alboater. Australia is another continent where many species are found. All members of the genus form mycorrhizal relationships with trees. Members of the genus are distinguished by their pinkish pore surfaces.

<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>Baorangia bicolor</i> Edible fungus in the genus Baorangia

Baorangia bicolor, also known as the two-colored bolete or red and yellow bolete after its two-tone coloring scheme of red and yellow, is an edible fungus in the genus Baorangia. It inhabits most of eastern North America, primarily east of the Rocky Mountains and in season during the summer and fall months but can be found across the globe in China and Nepal. Its fruit body, the mushroom, is classed as medium or large in size, which helps distinguish it from the many similar appearing species that have a smaller stature. A deep blue/indigo bruising of the pore surface and a less dramatic bruising coloration change in the stem over a period of several minutes are identifying characteristics that distinguish it from the similar poisonous species Boletus sensibilis. There are two variations of this species, variety borealis and variety subreticulatus, and several other similar species of fungi are not poisonous.

<i>Exsudoporus frostii</i> Species of fungus in the family Boletaceae found in North America

Exsudoporus frostii, commonly known as Frost's bolete or the apple bolete, is a bolete fungus first described scientifically in 1874. A member of the family Boletaceae, the mushrooms produced by the fungus have tubes and pores instead of gills on the underside of their caps. Exsudoporus frostii is distributed in the eastern United States from Maine to Georgia, and in the southwest from Arizona extending south to Mexico and Costa Rica. A mycorrhizal species, its fruit bodies are typically found growing near hardwood trees, especially oak.

<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, suggesting a saprobic lifestyle. Despite occasional appearances to the contrary, Aureoboletus mirabilis is mycorrhizal, and forms close mutualistic associations with hemlock roots.

<i>Caloboletus rubripes</i> Species of fungus

Caloboletus rubripes, commonly known as the red-stipe bolete or the red-stemmed bitter bolete, is a mushroom in the family Boletaceae. It was known as Boletus rubripes until 2014. Fruit bodies (mushrooms) are robust, with caps up to 18 cm in diameter, atop thick stipes 5–12 cm long. Mushrooms are non-toxic, but is so bitter as to be inedible. The mushroom flesh has a very strong bluing reaction when cut or damaged. and forms mycorrhizal relationships, primarily with conifers. It can be differentiated from similar boletes by its cap color and non-reticulate stipe.

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

Tylopilus plumbeoviolaceus, commonly known as the violet-grey bolete, is a fungus of the bolete family. First described in 1936, the mushroom has a disjunct distribution, and is distributed in eastern North America and Korea. The fruit bodies of the fungus are violet when young, but fade into a chocolate brown color when mature. They are solid and relatively large—cap diameter up to 15 cm (5.9 in), with a white pore surface that later turns pink, and a white mycelium at the base of the stem. The mushroom is inedible. A number of natural products have been identified from the fruit bodies, including unique chemical derivatives of ergosterol, a fungal sterol.

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

Tylopilus tabacinus is a species of bolete fungus in the family Boletaceae. It is characterized by a tawny-brown cap measuring up to 17.5 cm (6.9 in) in diameter, and a reticulated stem up to 16.5 cm (6.5 in) long by 6 cm (2.4 in) thick. A characteristic microscopic feature is the distinctive crystalline substance encrusted on the hyphae in the surface of the cap. The species is known from the eastern United States from Florida north to Rhode Island, and west to Mississippi, and from eastern Mexico. It is a mycorrhizal species, and associates with oak and beech trees.

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

Tylopilus alboater, called the black velvet bolete, by some, is a bolete fungus in the family Boletaceae. The species is found in North America east of the Rocky Mountains, and in eastern Asia, including China, Japan, Taiwan, and Thailand. A mycorrhizal species, it grows solitarily, scattered, or in groups on the ground usually under deciduous trees, particularly oak, although it has been recorded from deciduous, coniferous, and mixed forests.

<i>Boletus rubroflammeus</i> Species of fungus

Boletus rubroflammeus is a species of bolete fungus in the family Boletaceae. First described from Michigan in 1971, it is found in the eastern United States and Mexico, where it grows in a mycorrhizal association with hardwood trees. The fruit bodies (mushrooms) of the fungus have caps that are deep red to purplish red, and dark red pores. The stem has coarse, dark red reticulations and a narrow yellow area at the top. All parts of the mushroom quickly stain blue when injured or cut. Lookalikes include Boletus flammans, a lighter-colored species that grows with conifers. Other similar species can be distinguished by differences in distribution, morphology, staining reaction, and microscopic characteristics. Boletus rubroflammeus mushrooms are poisonous, and can cause gastrointestinal distress if consumed.

<i>Boletus curtisii</i> Species of fungus

Boletus curtisii is a species of fungus in the family Boletaceae. It produces small- to medium-sized fruit bodies (mushrooms) with a convex cap up to 9.5 cm (3.7 in) wide atop a slender stem that can reach a length of 12 cm (4.7 in). In young specimens, the cap and stem are bright golden yellow, although the color dulls to brownish when old. Both the stem and cap are slimy or sticky when young. On the underside of the cap are small circular to angular pores. The mushroom is edible, but not appealing. It is found in eastern and southern North America, where it grows in a mycorrhizal association with hardwood and conifer trees. Once classified as a species of Pulveroboletus, the yellow color of B. curtisii is a result of pigments chemically distinct from those responsible for the yellow coloring of Pulveroboletus.

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

Aureoboletus auriflammeus, commonly known as the flaming gold bolete, is a species of bolete fungus in the family Boletaceae. Described as new to science in 1872, it is found in eastern North America, where it grows in a mycorrhizal association with oaks. The caps of the fruit bodies are golden orange, with a yellow pore surface on the underside, and a reticulated (network-like) stem. The edibility of the mushroom is not known.

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

Aureoboletus projectellus is a species of bolete fungus in the family Boletaceae. Found in North America, and recently in Europe, it grows in a mycorrhizal association with pine trees.

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

Tylopilus rhoadsiae, commonly known as the pale bitter bolete, is a bolete fungus in the family Boletaceae native to the eastern United States.

<i>Harrya chromapes</i> Species of fungus

Harrya chromapes, commonly known as the yellowfoot bolete or the chrome-footed bolete, is a species of bolete fungus in the family Boletaceae. The bolete is found in eastern North America, Costa Rica, and eastern Asia, where it grows on the ground, in a mycorrhizal association with deciduous and coniferous trees. Fruit bodies have smooth, rose-pink caps that are initially convex before flattening out. The pores on the cap undersurface are white, aging to a pale pink as the spores mature. The thick stipe has fine pink or reddish dots (scabers), and is white to pinkish but with a bright yellow base. The mushrooms are edible but are popular with insects, and so they are often infested with maggots.

<i>Boletus subluridellus</i> Species of fungus

Boletus subluridellus is a species of bolete fungus in the family Boletaceae. Described as new to science in 1971 by American mycologists, the bolete is found in the eastern United States and Canada. It grows on the ground in coniferous and mixed forests in a mycorrhizal association with deciduous trees, especially oak. The fruit bodies (mushrooms) have orangish-red, broadly convex caps that are up to 10 cm (3.9 in) in diameter, with small, dark reddish pores on the underside. The pale yellow stipe measures 4–9 cm (1.6–3.5 in) long by 1.5–2.3 cm (0.6–0.9 in) thick. All parts of the fruit body will quickly stain blue when injured or touched.

<i>Sutorius eximius</i> Species of fungus

Sutorius eximius, commonly known as the lilac-brown bolete, is a species of fungus in the family Boletaceae. This bolete produces fruit bodies that are dark purple to chocolate brown in color with a smooth cap, a finely scaly stipe, and a reddish-brown spore print. The tiny pores on the cap underside are chocolate to violet brown. It is widely distributed, having been recorded on North America, South America, and Asia, where it grows in a mycorrhizal relationship with both coniferous and deciduous trees.

<i>Boletus amyloideus</i> Species of fungus

Boletus amyloideus is a rare species of bolete fungus in the family Boletaceae. It was described as new to science in 1975 by mycologist Harry D. Thiers, from collections made in California. It fruit bodies have a convex to somewhat flattened reddish-brown cap measuring 3–6 cm (1.2–2.4 in) in diameter. The pore surface on the cap underside is bright yellow, with small angular pores and tubes measuring 4–8 mm long. The spore print is olive-brown; basidiospores are smooth, amyloid, spindle shaped to ellipsoid, and have dimensions of 13–16 by 4.5–5.5 µm. The bolete is known only from coastal California, where it grows on the ground in mixed forests. Its edibility is unknown.

References

  1. 1 2 3 4 "Synonymy: Tylopilus felleus (Bull.) P. Karst., Revue mycol., Toulouse 3(no. 9): 16 (1881)". Species Fungorum. CAB International. Retrieved 2013-03-11.
  2. 1 2 3 4 5 6 7 8 Smith AH, Thiers HD (1971). The Boletes of Michigan. Ann Arbor: The University of Michigan Press. pp. 112–15.
  3. ↑ Bulliard JBF. (1788). Herbier de la France (in French). Vol. 8. Paris: Chez l'auteur, Didot, Debure, Belin. plate 379.
  4. ↑ Karsten PA. (1881). "Enumeratio Boletinearum et Polyporearum Fennicarum, systemate novo dispositarum". Revue Mycologique Toulouse. 3 (9): 16–19.
  5. 1 2 3 4 5 6 Nilson S, Persson O (1977). Fungi of Northern Europe 1: Larger Fungi (Excluding Gill-Fungi). Harmondsworth: Penguin. pp. 102–03. ISBN   978-0-14-063005-3.
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  7. ↑ Engler A, Prantl K (1900). Die natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten insbesondere den Nutzpflanzen : I. Tl., 1. Abt.: Fungi (Eumycetes) (in German). Vol. Teil 1, Abt.1**. Leipzig: Engelmann. p. 190.
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