Hexagonia hydnoides

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Hexagonia hydnoides
Hexagonia hydnoides 9789.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Polyporales
Family: Polyporaceae
Genus: Hexagonia
Species:
H. hydnoides
Binomial name
Hexagonia hydnoides
(Sw.) M.Fidalgo
Synonyms [1]
Species synonymy
  • Boletus fibrosusHook., (1822)
  • Boletus hydnoidesSw., (1806)
  • Boletus ursinusLink, (1809)
  • Cerrena hydnoides(Sw.) Zmitr., (2001)
  • Microporus ursinus(Link) Kuntze, (1898)
  • Pogonomyces hydnoides(Sw.) Murrill, (1904)
  • Polyporus fibrosusHook., (1822)
  • Polyporus hydnoides(Sw.) Fr., (1821)
  • Polyporus ursinus(Link) Fr., (1821)
  • Polyporus verrucosohirtusSpeg., (1884)
  • Polystictus ursinus(Link) Fr., (1886)
  • Polystictus verrucosohirtus(Speg.) Speg., (1888)
  • Scenidium hydnoides(Sw.) Jülich [as 'hydnoideum'], (1983)
  • Trametes hydnoides(Sw.) Fr., (1838)
  • Trametes ocellataBerk. & M.A. Curtis, (1868)
  • Trametes ursina(Link) Fr., (1849)
  • Trametes verrucosohirtus(Speg.) Speg., (1891)

Hexagonia hydnoides, also known as the hairy hexagonia, is a widely distributed species of bracket fungus in the Polyporaceae family. The name comes from the species' distinctive dark hairy bristles found on the cap - hydnoides meaning 'relating to Hydnum ,' a genus of toothed fungi. In general, it is known to grow in tropical regions across the globe and to grow on dead wood tissues, particularly that of hardwoods. It is a plant pathogen. This fungus is largely saprophytic, decaying dead wood tissues. [2]

Contents

Description

Morphology

Hexagonia hydnoides forms annual semicircular fruiting bodies, with a sessile, or stalkless, attachment to dead wood, such as that of a fallen oak. The pileus, or cap, is convex or nearly flat and has been reported to be anywhere from 1 to 2.5 centimeters in length all the way up to 5 to 10 centimeters in length, [3] [4] and can be up to 1.5 centimeters thick but is often much less. [5] The upper surface is zonate - having concentric striping patterns that can be faint to bright in coloration, and is otherwise brown or dark brown. The cap is distinctively covered in fine, dark brown to black bristles that dry and harden with age. The hymenium is brown to dark brown, and is composed of many thin, angular or hexagonal pores – 0.1 to 0.2 mm in diameter [3] and running 2 to 6 mm deep. [4] The hymenium of fresh specimens will bruise brown when damaged.

Hexagonia hydnoides pores under a stereo microscope Hexagonia pores.jpg
Hexagonia hydnoides pores under a stereo microscope

The microscopic morphology of this species includes spores that are 11–14 by 3.5-5 microns, which are cylindrical, smooth, hyaline/colorless, and inamyloid under Melzer's reagent. The hyphal system is trimitic, meaning that it contains generative, skeletal, and binding hyphae, and in addition has clamp connections present on the binding hyphae. [5]

Upper surface of H. hexagonia with zonate marking visible. 2015-07-19 Hexagonia hydnoides (Sw.) M. Fidalgo 545263.jpg
Upper surface of H. hexagonia with zonate marking visible.

Similar species

Many species that can be confused with Hexagonia hydnoides include bracket fungi which lack a stipe – examples may be Trametes versicolor (the turkey-tail) along with other Trametes species, Fuscoporia gilva , or Daedaleopsis confragosa . [6] Hexagonia hydnoides can sometimes be differentiated from lookalikes within the genus, notably Hexagonia hirta , by its much smaller pores and flat or slightly convex cap surface as described above.

Ecology

Hexagonia hydnoides is saprobic, most commonly decaying fallen hardwood trees. It is a white-rot fungus, meaning that it secretes enzymes that can break down components of the wood including cellulose, hemicellulose, and lignin, the latter of which is not digestible by some wood-decay fungi. [7] This fungus is also known to be a plant pathogen, decaying living wood, although this has not been researched in depth.

Distribution

The fungus can largely be found in tropical & subtropical forests, especially those in North America. Geographic data from iNaturalist shows that it has been sighted in the eastern United States, Mexico, Caribbean, Brazil, Spain, India, South Africa along with much of Central and South America and some Southern and East African countries. [6]

Taxonomy

Hexagonia hydnoides was placed within Boletus in its original description by Carl Linnaeus in 1753, along with most other fungi with poroid hymenia. The most recent widely accepted placement for the species is within Hexagonia.

It is disputed among researchers whether this species falls within the genus Cerrena or within the genus Hexagonia. A study published in 2001 reassigned this species to Cerrena, under the name Cerrena hydnoides [8] Species Fungorum lists Cerrena hydnoides as the currently accepted name for this species, [9] but this is not reflected in all of the modern literature.

Phylogeny

In a phylogenetic study done in 2013 on various genera within the order Polyporales , it was shown that Hexagonia hydnoides is a sister lineage to Irpex lacteus and Emmia latemarginata. Further investigation within this study argued that Hexagonia hydnoides is microscopically distinct from other members of its genus (Hexagonia hirta, Hexagonia apiaria) due to an arboriform (tree-like) branching pattern and sclerohyphae with inflated axial elements – and suggested the species be moved to Pogonomyces [10] .

Traditional medicine

Although Hexagonia hydnoides is considered inedible due to its tough, woody texture, therapeutic compounds within the basidiocarp can be extracted for use in traditional herbal medicines such as teas through being ground into a powder.

A study published in 2021 analyzed the common knowledge, usage, and effects of various fungi in traditional medicine in rural Northeastern Brazilian communities. H. hydnoides was specifically cited for use as a solution to colic in infants, as an antispasmodic therapy for the digestive system. H. hydnoides was further analyzed and found to have antibacterial properties as a result of saponin compounds. [11] A similar study found that extracts from H. hydnoides were effective as an antibacterial agent against Bacillus cereus . [12]

The usage of H. hydnoides in traditional medicine is endangered by increased access to commercially produced medicines, loss of tradition throughout generations, and a decline in fungal species populations due to environmental factors such as deforestation, which is particularly relevant to Hexagonia hydnoides' use among populations in South America, especially regarding the gradual loss of Brazilian rainforests. [11]

The fungus is also reported to be used in Mexico as a medicine for the treatment of pimples, warts, and ringworm. [3]

Related Research Articles

<span class="mw-page-title-main">Polypore</span> Group of fungi

Polypores are a group of fungi that form large fruiting bodies with pores or tubes on the underside. They are a morphological group of basidiomycetes-like gilled mushrooms and hydnoid fungi, and not all polypores are closely related to each other. Polypores are also called bracket fungi or shelf fungi, and they characteristically produce woody, shelf- or bracket-shaped or occasionally circular fruiting bodies that are called conks. Over one thousand polypore species have been described to science, but a large part of the diversity is still unknown even in relatively well-studied temperate areas.

<i>Cerrena unicolor</i> Species of fungus

Cerrena unicolor, commonly known as the mossy maze polypore, is a species of poroid fungus in the genus Cerrena. This saprobic fungus causes white rot.

<i>Daedaleopsis confragosa</i> Species of fungus

Daedaleopsis confragosa, commonly known as the thin walled maze polypore or the blushing bracket, is a species of polypore fungus in the family Polyporaceae. A plant pathogen, it causes a white rot of injured hardwoods, especially willows. The fruit bodies are semicircular and tough, have a concentrically zoned brownish upper surface, and measure up to 20 cm (8 in) in diameter. The whitish underside turns gray-brown as the fruit body ages, but bruises pink or red. It is found all year and is common in northern temperate woodlands of eastern North America, Europe, and Asia. The species was first described from Europe in 1791 as a form of Boletus, and has undergone several changes of genus in its taxonomic history. It acquired its current name when Joseph Schröter transferred it to Daedaleopsis in 1888.

<i>Fomes fasciatus</i> Species of fungus

Fomes fasciatus, common name the Southern Clam Shell, is a pathogenic white rot fungus in the family Polyporaceae. It is found in the southeastern United States and Central and South America where it can be seen growing on various dead and living hardwood trees. It was first described by Swedish botanist Olof Swartz in Jamaica in 1788 as Boletus fasciatus. It was later transferred by Cooke to Fomes fasciatus in 1885. The genus name "Fomes" translates to tinder as its holotype was historically used to start fires and the specific epithet "fasciatus" translates to "banded", in reference to the bands of brown to grey and black colors that the top of its fruiting body displays.

<i>Hydnellum peckii</i> Species of fungus

Hydnellum peckii is a fungus in the genus Hydnellum of the family Bankeraceae. It is a hydnoid species, producing spores on the surface of vertical spines or tooth-like projections that hang from the undersurface of the fruit bodies. It is found in North America, Europe, and was recently discovered in Iran (2008) and Korea (2010). Hydnellum peckii is a mycorrhizal species, and forms mutually beneficial relationships with a variety of coniferous trees, growing on the ground singly, scattered, or in fused masses.

<i>Trametes</i> Genus of fungi

Trametes is a genus of fungi that is distinguished by a pileate basidiocarp, di- to trimitic hyphal systems, smooth non-dextrinoid spores, and a hymenium usually without true hymenial cystidia. The genus has a widespread distribution and contains about 195 species. The genus was circumscribed by Elias Magnus Fries in 1836.

<i>Daedaleopsis</i> Genus of fungi

Daedaleopsis is a genus of fungi in the family Polyporaceae. The name Daedaleopsis is a reference to Daedalus, the labyrinth-maker of myth. Similarly, the maze-like pattern of pores is taxonomically described as being daedaloid. DNA was recovered and sequenced from fragments of a nearly 7000-year-old fruit body of D. tricolor found in an early Neolithic village in Rome.

<i>Crepidotus versutus</i> Species of fungus

Crepidotus versutus, commonly known as the evasive agaric, is a species of fungus in the family Crepidotaceae. It is saprobic on wood, like other Crepidotus species, but it can also decompose herbaceous forest litter. The species is characterized by large, punctate, ellipsoid spores, and the white, hairy pileus.

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

Xerocomellus zelleri, commonly known as Zeller's bolete, is an edible species of mushroom in the family Boletaceae. First described scientifically by American mycologist William Alphonso Murrill in 1912, the species has been juggled by various authors to several genera, including Boletus, Boletellus, and Xerocomus. Found solely in western North America from British Columbia south to Mexico, the fruit bodies are distinguished by their dark reddish brown to nearly black caps with uneven surfaces, the yellow pores on the underside of the caps, and the red-streaked yellow stems. The fungus grows in summer and autumn on the ground, often in Douglas fir forests or on their margins. The development of the fruit bodies is gymnocarpic, meaning that the hymenium appears and develops to maturity in an exposed state, not enclosed by any protective membrane.

<i>Bjerkandera</i> Genus of fungi

Bjerkandera is a genus of wood-rotting fungi in the family Meruliaceae.

<i>Favolus</i> Genus of fungi

Favolus, or honeycomb fungus, is a genus of fungi in the family Polyporaceae. The fruit bodies of Favolus species are fleshy with radially arranged pores on the underside of the cap that are angular and deeply pitted, somewhat resembling a honeycomb.

<i>Skeletocutis</i> Genus of fungi

Skeletocutis is a genus of about 40 species of poroid fungi in the family Polyporaceae. The genus has a cosmopolitan distribution, although most species are found in the Northern Hemisphere. It causes a white rot in a diverse array of woody substrates, and the fruit bodies grow as a crust on the surface of the decaying wood. Sometimes the edges of the crust are turned outward to form rudimentary bracket-like caps.

<i>Lentinus brumalis</i> Species of fungi

Lentinus brumalis is an inedible species of fungus in the family Polyporaceae. Its common name is the winter polypore. The epithet brumalis means "occurring in the winter", describing how this species tends to fruit during winter. It causes white rot on dead hardwood, and is distributed throughout the Northern Hemisphere in temperate and boreal zones.

<i>Xylobolus frustulatus</i> Species of fungus

Xylobolus frustulatus, commonly known as the ceramic fungus or ceramic parchment, is an inedible species of crust fungus in the Stereaceae family. The fruit body forms small, hard, flat crust-like aggregations that resemble broken pieces of ceramic tile. These pieces are initially whitish before turning yellow-brown to gray-brown in age. The spore-bearing cells cover the upper surfaces of the fruit body. A saprobic species, it grows on well-decayed oak wood in Asia, northern Europe, and North America.

<i>Nigroporus vinosus</i> Species of fungus

Nigroporus vinosus is a species of poroid fungus in the family Steccherinaceae, and the type species of the genus Nigroporus. Its fruit bodies have brownish caps with tinges of purple or red. The cap underside has a pore surface the same colour as the cap, and minute pores. Nigroporus vinosus has a pantropical distribution. It has been recorded from Africa, North America, Central America, South America, Asia, and Oceania. It is a wood-decay fungus that causes a white rot.

<i>Loweomyces fractipes</i> Species of fungus

Loweomyces fractipes is a species of poroid fungus in the family Steccherinaceae, and the type species of the genus Loweomyces. It is a widely distributed species, found in North America, Europe, Central America, South America, and Korea.

<i>Amylocystis lapponica</i> Species of fungus

Amylocystis lapponica is a species of bracket fungus in the family Fomitopsidaceae, and the type species of genus Amylocystis. It produces medium-sized, annual fruit bodies that are soft, and have a strong, distinct smell. The fungus is a saprophyte that feeds on coniferous wood of logs lying on the ground, and causes brown rot. It is a rather rare species that only occurs in old-growth forest.

<i>Phlebia tremellosa</i> Species of fungus

Phlebia tremellosa, commonly known as trembling Merulius or jelly rot, is a species of fungus in the family Meruliaceae. It is a common and widely distributed wood-decay fungus that grows on the rotting wood of both hardwood and conifer plants.

<i>Panus fasciatus</i> Species of fungus

Panus fasciatus is a species of fungus in the family Polyporaceae in the genus Panus of the Basidiomycota. P. fasciatus has a fruiting body in the shape of a funnel with a velvety texture, hence the nickname "hairy trumpet." When it was identified by D. Pegler of Kew, he created a subgroup of the Lentinus fungi, called Panus based on their hyphal systems. For this reason, Panus fasciatus is sometimes referred to as Lentinus fasciatus. Panus fasciatus has been described with numerous other names which were combined by Pegler in 1965.

Anjali Roy was an eminent Indian mycologist and academic. The fungus genus Royoporus is named in her honour.

References

  1. "Hexagonia hydnoides (Sw.) M. Fidalgo". Index Fungorum. CAB International. Archived from the original on 2012-06-10. Retrieved 2010-07-25.
  2. E.L. Barnard; Jason Smith. "Understanding Decay In Florida Trees" (PDF). University of Florida. Retrieved 22 February 2016.
  3. 1 2 3 "Cerrena hydnoides (Sw.) Zmitr. | Colombian Fungi made accessible". Plants of the World Online. Retrieved 2024-12-12.
  4. 1 2 "Hexagonia hydnoides (MushroomExpert.Com)". www.mushroomexpert.com. Retrieved 2024-12-12.
  5. 1 2 Bessette, Alan E. (2021). Polypores and Similar Fungi of Eastern and Central North America. Dianna Smith, Arleen R. Bessette. Austin: University of Texas Press. ISBN   978-1-4773-2272-7.
  6. 1 2 "Hairy Hexagonia (Hexagonia hydnoides)". iNaturalist. Retrieved 2024-12-12.
  7. "Hungry Fungi: White-Rot Fungi Eat All Components of the Wood They Decompose". Energy.gov. Retrieved 2024-12-12.
  8. Zmitrovich, I. V. (2001). "Some new combinations in Polyporaceae: sapienti sat". Mycena. 1 (1): 91–93.
  9. "Species Fungorum - Species synonymy". www.speciesfungorum.org. Retrieved 2024-12-12.
  10. Zmitrovich, I. V.; Malysheva, V. F. (2013). "Towards a phylogeny of Trametes alliance". Mycology and Phytopathology. 47 (6): 358–380.
  11. 1 2 "Medicinal fungi used by rural communities in Northeastern Brazil". Indian Journal of Traditional Knowledge. 20 (4). 2021-11-04. doi:10.56042/ijtk.v20i4.27775.
  12. Rosa, Luiz Henrique; Machado, Kátia M Gomes; Jacob, Camila Cristina; Capelari, Marina; Rosa, Carlos Augusto; Zani, Carlos Leomar (2003). "Screening of Brazilian basidiomycetes for antimicrobial activity". Memórias do Instituto Oswaldo Cruz. 98 (7): 967–974. doi:10.1590/S0074-02762003000700019. ISSN   0074-0276.