Meripilus giganteus

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Meripilus giganteus
Meripilus giganteus (Karst 1882).jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Polyporales
Family: Meripilaceae
Genus: Meripilus
Species:
M. giganteus
Binomial name
Meripilus giganteus
(Pers.) Karst. (1882)
Synonyms
  • Boletus giganteusPers. (1794)
Meripilus giganteus
Information icon.svg
Pores icon.pngPores on hymenium
Offset cap icon.svgNo cap icon.svg Cap is offset or indistinct
Decurrent gills icon2.svg Hymenium is decurrent
NA cap icon.svgLacks a stipe
Transparent spore print icon.svg
Spore print is white
Saprotrophic fungus.svgEcology is saprotrophic
Mycomorphbox Edible.pngEdibility is edible

Meripilus giganteus is a polypore fungus in the family Meripilaceae. It causes a white rot in various types of broadleaved trees, particularly beech (Fagus), but also Abies , Picea , Pinus , Quercus and Ulmus species. This bracket fungus, commonly known as the giant polypore or black-staining polypore, is often found in large clumps at the base of trees, although fruiting bodies are sometimes found some distance away from the trunk, parasitizing the roots. M. giganteus has a circumboreal distribution in the northern Hemisphere, and is widely distributed in Europe. In the field, it is recognizable by the large, multi-capped fruiting body, as well as its pore surface that quickly darkens black when bruised or injured.

Contents

Description

The basidiocarps consist of numerous rosette-like flattened fan-shaped pilei; they are typically 50–150 centimetres (20–59 in), rarely 250 centimetres (98 in) in diameter and 10–50 centimetres (3.9–19.7 in), rarely 90 centimetres (35 in) high. The individual caps, up to 10–50 centimetres (3.9–19.7 in), rarely 90 centimetres (35 in) in diameter and 1–5 centimetres (0.39–1.97 in) thick, arise from a common basal stem.

An older specimen of M. giganteus with brown, zonate pilei. Meripilus giganteus orijaski zbunac.jpg
An older specimen of M. giganteus with brown, zonate pilei.

The weight is 10–50 kilograms (22–110 lb), but the heaviest specimen can reach 90 kilograms (200 lb).

The color of the cap surface is pale tan to dull chestnut brown in young specimens but darkens in age to become concentric zones (zonate) of various shades of brown.

The surface is also finely fibrillose with tiny scales (squamules). There are 3 to 6 pores per millimeter on the underside; the pore surface bruises brown and black, helping to distinguish it from the similar species Grifola frondosa .

Infection of a tree is often through a dead tap root, and decay is largely restricted to roots, and then mainly on the underside. Infected trees often show thinning of the outer crown due to impaired root function. Tree failure is due to brittle fracture of degraded lateral roots. [1]

Microscopic features

Spores are roughly spherical to ovoid or ellipsoid in shape, with typical dimensions of 6–6.5 × 5.5–6  μm. Under a microscope, they appear translucent (hyaline), smooth, and nonamyloid, meaning that they do not absorb stain from Melzer's reagent. [2] The basidia the spore-bearing cellsare club-shaped, 4-spored, and are 2240 by 78 μm. [3]

Polypore fungi may be further distinguished by the type of hyphae that makes up their fruiting body. M. giganteus has a so-called monomitic hyphal system, as its fruiting body is composed of only vegetative hyphae. [4]

Edibility

The giant polypore was previously considered inedible, due to its very coarse flesh and mildly acidic taste, [5] but more recent sources list it as edible. [6] [7] Younger specimens may be more palatable; one author notes that it is "eaten in Japan". [4] Also, it may be mistakenly consumed because of its resemblance with the edible species commonly known as Hen of the Woods ( Grifola frondosa ) which is regarded as much better tasting. [7]

Habitat and distribution

Although usually found on tree trunks, it is not uncommon to find it away from the tree Meripilus giganteus Antwerp Nachtegalenpark September 2013.jpg
Although usually found on tree trunks, it is not uncommon to find it away from the tree

This mushroom can be found growing on hardwoods, more rarely on conifers. According to Ryvarden and Gilbertson in their monograph on the polypores of Europe, M. giganteus grows especially on Quercus and Fagus tree species, but it has also been collected on the hardwoods Acer , Aesculus , Alnus , Betula , Castanea , Celtis , Corylus , Eucalyptus , Laurus , Myrica , Persea , Pittosporum , Platanus , Populus , Prunus , Pyrus , Tilia , Ulmus ; it has also been found growing on the coniferous species Abies , Larix , and Pinus . [3]

M. giganteus has a circumboreal distribution in the northern hemisphere. [8] It has been collected from Europe, Scandinavia, the area formerly known as the USSR, Iran and Turkey. [9] Although many field guides list it as occurring in North America, this is due to confusion with the related M. sumstinei; M. giganteus is not found in North America. [10] [2] A study of the frequency of occurrence of wood-decay fungi on street trees and park trees in Hamburg, Germany found that M. giganteus was the most common species. [11]

Similar species

The polypore fungus Grifola frondosa is similar in overall appearance, but may be distinguished by its more greyish cap, and larger pores. [3] Bondarzewia berkeleyi or "Berkeley's polypore" is often confused with M. giganteus (or M. sumstinei) in eastern North America but can be distinguished by its lack of black-bruising and much larger pores. [12]

Related Research Articles

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

The Polyporales are an order of about 1800 species of fungi in the division Basidiomycota. The order includes some polypores as well as many corticioid fungi and a few agarics. Many species within the order are saprotrophic, most of them wood-rotters. Some genera, such as Ganoderma and Fomes, contain species that attack living tissues and then continue to degrade the wood of their dead hosts. Those of economic importance include several important pathogens of trees and a few species that cause damage by rotting structural timber. Some of the Polyporales are commercially cultivated and marketed for use as food items or in traditional Chinese medicine.

<i>Laetiporus</i> Genus of edible mushrooms

Laetiporus is a genus of edible mushrooms found throughout much of the world. Some species, especially Laetiporus sulphureus, are commonly known as sulphur shelf, chicken of the woods, the chicken mushroom, or the chicken fungus because it is often described as tasting like and having a texture similar to that of chicken meat.

<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.

<i>Laetiporus sulphureus</i> Species of fungus

Laetiporus sulphureus is a species of bracket fungus found in Europe and North America. Its common names are crab-of-the-woods, sulphur polypore, sulphur shelf, and chicken-of-the-woods. Its fruit bodies grow as striking golden-yellow shelf-like structures on tree trunks and branches. Old fruitbodies fade to pale beige or pale grey. The undersurface of the fruit body is made up of tubelike pores rather than gills.

<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>Phaeolus schweinitzii</i> Species of fungus

Phaeolus schweinitzii, commonly known as velvet-top fungus, dyer's polypore, dyer's mazegill, or pine dye polypore, is a fungal plant pathogen that causes butt rot on conifers such as Douglas-fir, spruce, fir, hemlock, pine, and larch. P. schweinitzii is a polypore, although unlike bracket fungi the fruiting body may appear terrestrial when growing from the roots or base of the host tree.

<i>Phellinus igniarius</i> Species of fungus

Phellinus igniarius, commonly known as the willow bracket, fire sponge,false tinder polypore, or false tinder conk, is a fungus of the family Hymenochaetaceae. Like other members of the genus of Phellinus, it lives by saprotrophic nutrition, in which the lignin and cellulose of a host tree is degraded and is a cause of white rot.

<i>Albatrellus subrubescens</i> Species of fungus in the family Albatrellaceae found in Asia, Europe and North America

Albatrellus subrubescens is a species of polypore fungus in the family Albatrellaceae. The fruit bodies (mushrooms) of the fungus have whitish to pale buff-colored caps that can reach up to 14.5 cm (5.7 in) in diameter, and stems up to 7 cm (2.8 in) long and 2 cm (0.8 in) thick. On the underside of the caps are tiny light yellow to pale greenish-yellow pores, the site of spore production. When the fruit bodies are fresh, the cap and pores stain yellow where exposed, handled, or bruised.

<i>Daedalea quercina</i> Species of fungus

Daedalea quercina is a species of mushroom in the order Polyporales, and the type species of the genus Daedalea. Commonly known as the thick-walled maze polypore, maze-gill fungusoak-loving maze polypore, or oak mazegill, the specific epithet refers to the oak genus Quercus, upon which it frequently grows, causing a brown rot. It is found in Europe, Asia, Northern Africa and Australasia. Though inedible, it can be used as a natural comb and has been the subject of chemical research.

<i>Fuscoporia torulosa</i> Species of fungus

Fuscoporia torulosa is a species of bracket fungus in the genus Fuscoporia, family Hymenochaetaceae. A wood-decay fungus, it causes a white rot of heartwood in dead and living hardwood trees in Europe, and in coniferous trees in North America.

<i>Neofavolus alveolaris</i> Species of fungus

Neofavolus alveolaris, commonly known as the hexagonal-pored polypore, is a species of fungus in the family Polyporaceae. It causes a white rot of dead hardwoods. Found on sticks and decaying logs, its distinguishing features are its yellowish to orange scaly cap, and the hexagonal or diamond-shaped pores. It is widely distributed in North America, and also found in Asia, Australia, and Europe.

<i>Grifola frondosa</i> Species of fungus

Grifola frondosa is a polypore mushroom that grows at the base of trees, particularly old growth oaks or maples. It is typically found in late summer to early autumn. It is native to China, Europe, and North America.

<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>Fomes fomentarius</i> Species of fungus

Fomes fomentarius is a species of fungal plant pathogen found in Europe, Asia, Africa and North America. The species produces very large polypore fruit bodies which are shaped like a horse's hoof and vary in colour from a silvery grey to almost black, though they are normally brown. It grows on the side of various species of tree, which it infects through broken bark, causing rot. The species typically continues to live on trees long after they have died, changing from a parasite to a decomposer.

<i>Hapalopilus rutilans</i> Species of fungus

Hapalopilus rutilans is a species of polypore fungus in the family Polyporaceae. Officially described in 1821, it was transferred to its current genus Hapalopilus six decades later. It is commonly known as the tender nesting polypore, purple dye polypore, or the cinnamon bracket. This widely distributed species is found on five continents. It grows on the fallen or standing dead wood of deciduous trees, in which it fruits singly, in groups, fused, or in overlapping clusters. Fruit bodies are in the form of kidney-shaped to semicircular, cinnamon-orange-brown brackets. The underside of the fruit body features a yellowish to brownish pore surface with tiny angular pores, from which spores are released.

<i>Pycnoporellus alboluteus</i> Species of fungus

Pycnoporellus alboluteus, commonly known as the orange sponge polypore, is a species of polypore fungus in the family Fomitopsidaceae. Distributed throughout the boreal conifer zone, the fungus is found in mountainous regions of western North America, and in Europe. It causes a brown cubical rot of conifer wood, especially spruce, but also fir and poplar. The soft, spongy orange fruit bodies grow spread out on the surface of fallen logs. Mature specimens have tooth-like or jagged pore edges. A snowbank mushroom, P. alboluteus can often be found growing on logs or stumps protruding through melting snow. Although the edibility of the fungus and its usage for human culinary purposes are unknown, several species of beetles use the fungus as a food source.

<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.

References

  1. Fungal Strategies of Wood Decay in Trees - Schartze, Engels and Mattheck (2000)
  2. 1 2 Larsen, Michael J; Lombard, Frances F (1988). "The Status of Meripilus giganteus (Aphyllophorales, Polyporaceae) in North America". Mycologia. 80 (5): 612–21. doi:10.2307/3807709. JSTOR   3807709.
  3. 1 2 3 Ryvarden L. (1993). European Polypores (Part 2). Oslo, Norway: Lubrecht & Cramer Ltd. pp. 395–97. ISBN   978-82-90724-12-7.
  4. 1 2 Schmidt O. (2006). Wood and Tree Fungi: Biology, Damage, Protection, and Use. Berlin: Springer. p. 23. ISBN   978-3-540-32138-5.
  5. Bondartsev AS. (1953). The Polyporaceae of the European USSR and Caucasia. Akad. Nauk SSSR Bot. Inst. Komarova. [In Russian, translated by Israel Prog. Sci. Transl.] Jerusalem, 1971. 725 pp.
  6. Phillips, Roger (2010). Mushrooms and Other Fungi of North America. Buffalo, NY: Firefly Books. pp. 300–1. ISBN   978-1-55407-651-2.
  7. 1 2 Miller Jr., Orson K.; Miller, Hope H. (2006). North American Mushrooms: A Field Guide to Edible and Inedible Fungi. Guilford, CN: FalconGuides. p. 421. ISBN   978-0-7627-3109-1.
  8. Schmidt, 2006, p. 197.
  9. Niemela T, Uotila P. "Lignicolous macrofungi from Turkey and Iran." (1977). Karstenia 17(1): 33–9.
  10. "Missouri Mycological Society Voucher Specimens: Meripilus giganteus". Archived from the original on 2010-10-23. Retrieved 2008-11-09.
  11. Seehan G. (1979). "Holzerstörende Pilze an Straßen- und Parkbäumen in Hamburg." Mitt. Dtsch. Dendrolog. Ges. 71: 193–221.
  12. Brill, Steve. "Black-Staining Polypore".

Cited literature