Turbinellus Floccosus

''Turbinellus floccosus'', commonly known as the scaly vase, or sometimes the shaggy, scaly, or woolly chanterelle, is a cantharelloid mushroom of the family Gomphaceae native to Asia and North America. It was known as ''Gomphus floccosus'' until 2011, when it was found to be only distantly related to the genus's type species, '' G. clavatus''. It was consequently transferred from '' Gomphus'' to ''Turbinellus''. The orange-capped vase- or trumpet-shaped fruiting bodies may reach 30 cm (12 in) high and 30 cm (12 in) wide. The lower surface, the hymenium, is covered in wrinkles and ridges rather than gills or pores, and is pale buff or yellowish to whitish.

''T. floccosus'' forms symbiotic ( ectomycorrhizal) relationships with various types of conifer, growing in coniferous woodlands across Eastern Asia, from North Korea to Pakistan, and in North America, more frequently in the west, in late summer and autumn. Though mild-tasting, they generally cause gastrointestinal symptoms of nausea, vomiting and diarrhoea when consumed. ''T. floccosus'' is eaten by local people in northeastern India, Nepal and Mexico.

Taxonomy

This species was first described as ''Cantharellus floccosus'' in 1834 by American mycologist Lewis David de Schweinitz, who reported it growing in beech woods in Mount Pocono, Pennsylvania. Its specific epithet is derived from the Latin ''floccus'', meaning "tuft, or flock, of wool". In 1839, Miles Joseph Berkeley named a specimen from Canada as ''Cantharellus canadensis'' based on a manuscript by Johann Friedrich Klotzsch, noting its affinity to ''C. clavatus''. A large specimen collected in Maine by Charles James Sprague was described as ''Cantharellus princeps'' in 1859 by Berkeley and Moses Ashley Curtis. In 1891, German botanist Otto Kuntze renamed ''Cantharellus canadensis'' as ''Trombetta canadensis'', and ''C. floccosus'' as ''Merulius floccosus''.

Franklin Sumner Earle made ''C. floccosus'' the type species of the new genus ''Turbinellus'' in 1909, in which he placed two other North American species. He remarked that the three "constitute a striking and well-marked genus which seems to have more in common with the club-shaped species of ''Craterellus'' than with the following genus where they have always been placed." This was not widely taken up, as Earle's new combination was not published validly according to nomenclatural rules.

American mycologist Elizabeth Eaton Morse described ''Cantharellus bonarii'' in 1930. The type locality was General Grant National Park in Fresno County, California. In 1945 ''C. floccosus'' and Morse's ''C. bonarii'' were transferred to '' Gomphus'' by Rolf Singer. The generic name is derived from the Ancient Greek , , meaning "plug" or "large wedge-shaped nail". Alex H. Smith treated the members of ''Gomphus'' as two sections—''Gomphus'' and ''Excavatus''—within ''Cantharellus'' in his 1947 review of chanterelles in western North America, as he felt there were no consistent characteristics that distinguished the genera. The shaggy chanterelle was placed in the latter section due to its scaly cap, lack of clamp connections and rusty-colored spores. Roger Heim classified it in the genus ''Nevrophyllum'', before E. J. H. Corner returned it to ''Gomphus'' in 1966.

The genus ''Gomphus'', along with several others in the Gomphaceae, was reorganized in the 2010s after molecular analysis confirmed that the older morphology-based classification did not accurately represent phylogenetic relationships. Thus the genus ''Turbinellus'' was resurrected and the taxon became ''Turbinellus floccosus''. Giachini also concluded ''G. bonarii'' was the same species.

''T. floccosus'' has been given the common names of ''scaly vase chanterelle'', ''scaly chanterelle'', ''woolly chanterelle'', or ''shaggy chanterelle'', though it is more closely related to stinkhorns than true chanterelles. In Nepal, in the Sherpa language, it is known as or , from the words , meaning "oil lamp" and , meaning "mushroom", as the fruit bodies have a shape similar to the local oil lamps. In Mexico, it is known as or , or by the indigenous words ("fir mushroom", from Nahuatl "fir", and "mushroom"), (derived from , Nahuatl for "trumpet") or in Tlaxcala.

Description

Adult fruit bodies are initially cylindrical, maturing to trumpet- or vase-shaped and reaching up to 30 cm (12 in) high and up to 30 cm (12 in) across. There is no clear demarcation between the cap and stipe. The stipe can be up to 15 cm (6 in) tall and 6 cm (2.4 in) wide, though it tapers to a narrower base. It is solid in younger specimens, though is often hollowed out by insect larvae in older. At higher elevations, two or three fruit bodies may arise from one stipe. Colored various shades of reddish- to yellowish-orange, the cap surface is broken into scales, with the spaces between more yellow and the scales themselves more orange. The most colorful specimens occur in warm humid weather. Older specimens are often paler.

The white flesh is fibrous and thick, though thins with age. Somewhat brittle, it can sometimes turn brown when cut or bruised. The smell has been reported as indistinct or "earthy and sweet", and the taste "sweet and sour". The spore-bearing undersurface is irregularly folded, forked or ridged rather than gilled and is pale buff or yellowish to whitish in color. These ridges are up to high, and are decurrent—they extend below and run down the cap's attachment to the stipe, though irregularly so. The spore print is brownish, the spores ellipsoid with dimensions of 12.4–16.8 × 5.8–7.3  μm. The spore surface is roughened with ornamentations that can be made visible under the microscope by staining with methyl blue.

The fruit bodies can last for some considerable time, growing slowly over a month. Mushrooms in subalpine and alpine areas are typically heavy-set with a short stipe, their growth slower in the cold climate. This latter form is seen at lower altitudes in colder seasons. Smith gave this the name forma ''rainierensis''. Conversely, mushrooms at low altitudes, such as in the redwood forests, can grow and expand rapidly with large caps that have prominent scales. Smith described a paler form with a solid stipe from the Sierra Nevada as forma ''wilsonii''. American mycologist R. H. Petersen described an olive-capped form that is otherwise identical to the typical form. These forms are not recognised as distinct.

Similar species

The related '' Turbinellus kauffmanii'', found in western North America, is similar-looking but has a pale brown cap. Younger specimens of the latter species also have a pungent smell. '' Turbinellus fujisanensis'', found in Japan, is another lookalike that has smaller spores than ''T. floccosus''. ''Gomphus clavatus'' is superficially similar.

Distribution and habitat

The fungus appears to form symbiotic ( ectomycorrhizal) relationships with various conifers including Douglas-fir (''Pseudotsuga menziesii''), fir (''Abies'') species such as momi fir (''Abies firma''), European silver fir ('' A. alba'') and Khinghan fir ('' A. nephrolepis''), Pine (''Pinus'') species such as ''Pinus densiflora'' and western hemlock (''Tsuga heterophylla''). In Mexico, the fungus associates with ''Abies religiosa''—the mycorrhizal association between these two species has been synthesized under controlled laboratory conditions. ''T. floccosus'' is more abundant in older stands of trees and places where there is more decomposed wood on the forest floor.

The species occurs in coniferous forests in North America, particularly the western states in late summer and autumn. It is most abundant in rainy parts of the Pacific Northwest, northern California and the Sierra Nevada. It also occurs across Asia, having been recorded from Japan, North Korea, China, Tibet, India, Nepal and Pakistan. ''Turbinellus floccosus'' has been occasionally recorded from introduced conifer plantations in Australia.

Toxicity

''Turbinellus floccosus'' is poisonous to some people who eat it, but has been consumed without incident by others. Nausea, vomiting and diarrhea may occur, though are sometimes delayed by up to 8–14 hours. A tricarboxylic acid known as α-tetradecylcitric acid may be responsible for the extreme gastrointestinal symptoms. Laboratory experiments showed it increased tone of guinea pig smooth muscle of the small bowel (ileum), and that when given to rats, it led to mydriasis, skeletal muscle weakness, and central nervous system depression. ''Turbinellus floccosus'' contains more than double the amount of this acid than the related ''T. kauffmanii''.

Despite its toxicity, ''T. floccosus'' is one of the ten wild mushrooms most widely consumed by ethnic tribes in Meghalaya, northeast India, and is highly regarded by the Sherpa people in the vicinity of Sagarmatha National Park in Nepal. What is not known is whether the Indian populations of ''T. floccosus'' are nontoxic, or whether the local people have developed an immunity to it. It is also enjoyed in Mexico. American mycologist David Arora reported that some enjoyed it while he felt it had a strong sour taste.

The fruit body of ''T. floccosus'' produces oxylipin (lipids generated by oxygenation of fatty acids) that are active against the fungal plant pathogens ''Colletotrichum fragariae'', '' C. gloeosporioides'', and '' C. acutatum''. Extracts of the fungus have shown in standard laboratory tests to have antimicrobial activity against several human pathogenic strains. ''T. floccosus'' also contains the dicatecholspermidine derivative pistillarin, a compound that inhibits DNA damage by hydroxyl radicals generated by the Fenton reaction. Pistillarin is responsible for the green color obtained when iron salts are applied to the fruit body surface.

Notes

References

External links

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{{Taxonbar, from=Q2031545

Gomphaceae
Poisonous fungi
Fungi of North America
Fungi of Asia
Inedible fungi
Fungi described in 1832
Edible fungi
Taxa named by Lewis David de Schweinitz