Trametes hirsuta: The Ultimate Mushroom Guide
About The Trametes hirsuta Mushroom
Trametes hirsuta is a fungal plant pathogen. It is found on dead wood of deciduous trees, especially beechwood. This mushroom grows all year round and persists due to its leathery nature.
The cap is white to gray, covered with short hairs, sometimes with a yellowish, tomentose margin, and usually is less obviously zoned than T. versicolor.
When very young is easily confused with Downy Bracket Trametes pubescens, but as it matures the Hairy Bracket develops tell-tale concentric ridged color zones (see below) which clearly distinguish it from its more finely downy relative.
Other names: Hairy Bracket.
Trametes hirsuta Identification
Saprobic on the deadwood of hardwoods (very rarely reported on conifer wood); annual; causing a white rot; growing in clusters on logs and stumps; summer and fall; widely distributed across North America.
Up to 10 cm across and 6 cm deep; semicircular, irregularly bracket-shaped, or kidney-shaped; often fusing laterally with other caps; very densely hairy; often finely, radially furrowed; with concentric zones of texture; zones with gray, whitish, and brownish shades, but usually not contrasting markedly; margin often brownish to brown or blackish.
Whitish, becoming a little brownish, grayish, or yellowish with age; with 3-4 circular to angular pores per mm; tubes with fairly thick walls, to 6 mm deep.
Insubstantial; whitish; tough and corky.
Spore Print: White.
Trametes pubescens is an even paler bracket with a finely downy rather than coarsely hairy upper surface.
Trametes hirsuta Medicinal Properties
Aqueous extract Improves macrophage phagocytic activity
Immunomodulation activity from enhancing the number of vitality in Natural Killer cells, (NK cells)
Polysaccharides from T. hirsuta induced NK cell activation and significantly increased NK cell-mediated cytotoxicity. This study1 explained; “NK cells begin to proliferate and secrete cytokines as a means of communication with other components of the immune system, in particular T cells. NK cells are best known for their capacity to kill tumor cells and there is evidence for their role in controlling infection in the earliest phases of body’s immune responses.”
Genoprotective activity of mushroom extracts are based on the reduction of oxidative damages of DNA. There is an abundance of free radicals in the environment associated with oxidative stress and as this paper2 explains, is the basis of aging and the initiation and progress of various diseases.
The fruiting body extract at the concentration of 20.0 mg mL -1 showed a genotoxic effect and DNA damage in cells was significantly less compared with the control. This was found to be dose-dependent, and at lower concentrations, there was no significant genotoxic effect.
Antioxidant, free radical scavenging activity of 59% reduction of radicals.
Trametes hirsuta Taxonomy & Etymology
The Hairy Bracket fungus was described scientifically in 1789 by the Austrian mycologist Franz Xavier von Wulfen (1728 - 1805), who gave it the binomial name Polyporus hirsutus. In 1924 American mycologist Curtis Gates Lloyd (1859 - 1928) transferred this species to the genus Trametes, establishing its currently-accepted scientific name Trametes hirsuta.
Synonyms of Trametes hirsuta include Daedalea polyzona, Boletus hirsutus Wulfen, Polyporus hirsutus (Wulfen) Fr., Coriolus hirsutus (Wulfen) Quél., and Polystictus hirsutus (Wulfen) Cooke.
Trametes, the genus name, comes from the prefix tram- meaning thin - hence the implication is that fruitbodies of fungi in this genus are thin in section.
The specific epithet hirsuta is derived from the Latin adjective hirsutus, meaning coarsely hairy, and is a reference to the hairy upper surfaces of young brackets of this species.
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