
The Bleeding Tooth Fungus (Hydnellum peckii) is a type of mushroom that appears to bleed from its pores. Despite its alarming appearance, the mushroom is not toxic, though it is inedible due to its bitter taste. The mushroom is found in forested regions of North America, Europe, Iran, and South Korea, and has a symbiotic relationship with coniferous trees. Scientists are currently studying the fungus for its potential medicinal properties, including its possible use as an anticoagulant and antibacterial agent.
| Characteristics | Values |
|---|---|
| Common Name | Bleeding Tooth Fungus |
| Scientific Name | Hydnellum peckii |
| Appearance | White when young, turns brownish with age |
| Taste | Bitter and unpalatable |
| Smell | Sweetish odor |
| Found In | North America, Europe, Iran, South Korea |
| Habitat | Forested regions, coniferous trees |
| Toxicity | Not toxic, but inedible |
| Uses | May have medicinal properties, used as a dye |
| Other Names | Devil's Tooth, Strawberries and Cream, Red-juice Tooth, Peck's Hydnum |
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What You'll Learn

Bleeding tooth fungus is not toxic to humans
The Bleeding tooth fungus, or Hydnellum peckii, is a unique variety of mushroom that exudes a red liquid, resembling blood. Despite its ominous appearance, the Bleeding tooth fungus is not toxic to humans. In fact, it may offer a range of health benefits and has been studied for its potential medicinal properties.
The Bleeding tooth fungus is characterised by its whitish colour when young, gradually turning brownish as it matures. Its distinctive feature is the red liquid it secretes, which is believed to be a type of sap caused by excess water absorption. This phenomenon, known as guttation, occurs when water is forced into the roots of the fungus through osmosis due to wet soil conditions. The red pigment is derived from the fungus itself and is not an indication of toxicity.
While the Bleeding tooth fungus is not toxic, its taste is described as bitter and unpalatable, making it inedible. However, it has found utility among natural dyers, who dry the fungus to create beige dyes. Additionally, when combined with substances like alum or iron, the dye can produce blue or green hues.
Beyond its use in dyeing, the Bleeding tooth fungus has garnered scientific interest for its potential medicinal properties. It contains the chemical compound atromentin, which acts as an anticoagulant and may possess antibacterial properties effective against bacterial pneumonia. Furthermore, the fungus contains thelephoric acid, which is being investigated for its potential in treating Alzheimer's disease.
The Bleeding tooth fungus is typically found in forested regions, particularly in North America, Europe, Iran, and South Korea. It often grows among coniferous trees, forming a symbiotic relationship by enhancing nutrient absorption in exchange for carbon dioxide. Despite its fascinating characteristics and potential benefits, the Bleeding tooth fungus is facing a decline in certain regions due to factors such as increased pollution and excess nitrogen in the soil.
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The mushroom is known for its blood-like secretions
The Hydnellum peckii, more commonly known as the Bleeding Tooth Fungus, is a species of mushroom known for its blood-like secretions. This distinctive feature is caused by a process called guttation, where water is forced into the roots of the fungus through osmosis when the surrounding soil becomes very wet. This creates pressure that eventually forces a red liquid to the surface. While the exact composition of this liquid is unknown, it is believed to be a type of sap and is known to contain a pigment with anticoagulant properties similar to heparin.
The Bleeding Tooth Fungus is native to forested regions in North America, Europe, Iran, and South Korea. It is often found in coniferous forests, where it forms a symbiotic relationship with vascular plants and coniferous trees, particularly Douglas-fir, fir, and hemlock. The fungus provides enzymes that help convert amino acids and minerals in the soil into forms that the host trees can better utilise, while the trees provide the fungus with access to carbon dioxide.
The Bleeding Tooth Fungus has a unique appearance, with a whitish cap that turns slightly brownish with age and is covered in slender, cylindrical spines. The flesh of the fungus is a pale pinkish-brown colour, and the spores are ellipsoid and non-amyloid. Despite its striking appearance, the Bleeding Tooth Fungus is not toxic, although it is considered inedible due to its bitter taste.
However, the fungus is valued for its potential medicinal properties. It contains the chemical compound atromentin, which has anticoagulant and antibacterial properties. Additionally, the fungus contains thelephoric acid, which is being studied for its potential use in treating Alzheimer's disease. While the blood-like secretions of the Bleeding Tooth Fungus may seem eerie, this unique characteristic has the potential to contribute to important medical advancements.
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It is inedible due to its bitter taste
The Bleeding Tooth Fungus (Hydnellum peckii) is not toxic but is considered inedible due to its bitter taste. It is a type of mushroom that is found in forested regions of North America, Iran, South Korea, and Europe. It is often found in coniferous forests, growing on the ground singly, scattered, or in fused masses.
The mushroom gets its name from its appearance, which includes a thick substance that oozes out and looks like blood. This "bleeding" aspect is thought to be caused by excess absorption of water, resulting in a type of sap being forced out through the mushroom. While it may look unappetizing, the fungus is not dangerous and may even offer health benefits. However, its bitter taste makes it unpalatable.
The adult mushroom is beige or brown and rather dull in appearance. When young and actively growing, the whitish mushroom appears to bleed from its pores, with a gooey red liquid that is caused by a process called guttation. This liquid is thought to be a type of sap and contains a pigment with anticoagulant properties similar to heparin.
Despite its unappetizing appearance and bitter taste, the Bleeding Tooth Fungus has been studied for its potential medical benefits. It contains atromentin, a chemical compound with anti-bacterial properties that may be useful in treating bacterial pneumonia. Additionally, the fungus contains thelephoric acid, which is being investigated for its potential in treating Alzheimer's disease.
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The fungus has potential medicinal properties
Bleeding tooth fungus (Hydnellum peckii) is not toxic. Its unusual appearance—a whitish mushroom that appears to bleed from its pores—has earned it colourful names such as Devil's Tooth and Strawberries and Cream. The red liquid is a sap caused by a process called guttation, which occurs when the soil surrounding the fungus' root system becomes very wet, forcing water into the roots through osmosis.
Anticoagulant properties
Extracts from the Bleeding Tooth Fungus contain the chemical compound atromentin, which has anticoagulant properties similar to heparin. Atromentin can help prevent blood clots from forming and may be useful in treating bacterial pneumonia.
Antibacterial properties
Atromentin, the compound found in the Bleeding Tooth Fungus, also exhibits antibacterial activity. It inhibits the enzyme enoyl-acyl carrier protein reductase, which is essential for the biosynthesis of fatty acids in bacteria such as Streptococcus pneumoniae.
Treatment for Alzheimer's disease
Thelephoric acid, another chemical found in the Bleeding Tooth Fungus, may have potential in the treatment of Alzheimer's disease.
Dye for textiles
While not a direct medicinal property, the use of Bleeding Tooth Fungus as a natural dye is worth mentioning. The fungus is valued by natural dyers, who dry it to create a beige dye. When combined with mordants like alum or iron, the dye can produce blue-green hues.
The Bleeding Tooth Fungus has a wide distribution in North America, particularly in the Pacific Northwest, and its range extends north to Alaska and east to North Carolina. It is also found in Europe, Iran, and South Korea. The species is becoming increasingly rare in several European countries due to increased pollution.
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It is found in forested regions across the world
The Bleeding Tooth Fungus (Hydnellum peckii) is found in forested regions across the world, particularly in North America, Europe, Iran, and South Korea. It is often found in mountainous areas, hiding among the mosses and needles of shady conifer forests. The fungus has a symbiotic relationship with coniferous trees, providing them with access to carbon dioxide in exchange for fixed sources of carbon dioxide. Its presence indicates an old, species-rich forest, and its disappearance from certain areas due to pollution is a cause for concern among scientists.
The distinctive feature of the Bleeding Tooth Fungus is its appearance of "bleeding" bright red droplets when young and actively growing. This "bleeding" is caused by a process called guttation, where excess water absorption forces sap out through the mushroom's pores. As the fungus matures, it develops into a bland brown mushroom with unremarkable characteristics. Despite its eerie appearance, the Bleeding Tooth Fungus is not toxic, although it is inedible due to its bitter taste.
The Bleeding Tooth Fungus has a wide distribution in North America, particularly in the Pacific Northwest, extending north to Alaska and east to North Carolina. It is commonly found in association with Douglas-fir, fir, and hemlock trees in the Puget Sound area of Washington and along the Oregon Coast under lodgepole pine. In Europe, the fungus has been documented in Italy, Germany, Scotland, Norway, the Netherlands, and the Czech Republic, although it is becoming rarer in some of these countries due to increased pollution.
The Bleeding Tooth Fungus is valued by natural dyers, who use the dried fungus to create beige, blue, or green dyes, depending on the substances combined with it. Additionally, the fungus has potential medical benefits, containing the chemical compound atromentin, which has anticoagulant and antibacterial properties. Another chemical found in the fungus, thelephoric acid, may have potential in treating Alzheimer's disease.
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Frequently asked questions
No, bleeding mushrooms are not toxic, but they do have a bitter taste and are considered inedible.
Bleeding mushrooms, also known as Bleeding Tooth Fungi, are a type of mushroom that “bleeds" a thick, blood-like substance from their pores. The "bleeding" is caused by excess absorption of water, resulting in a build-up of pressure that forces the liquid to the surface of the mushroom.
Bleeding mushrooms are typically found in forested regions, particularly in North America, Europe, Iran, and South Korea. They are often found in coniferous forests, growing on the ground near trees such as Douglas-fir, fir, and hemlock.
Yes, while the mushrooms themselves are not typically consumed, they have been studied for their potential medical benefits. They contain chemicals such as atromentin, which has anticoagulant and antibacterial properties, and thelephoric acid, which may have potential in treating Alzheimer's disease.
The "bleeding" in bleeding mushrooms is caused by a process called guttation, where excess water is absorbed by the mushroom, leading to a build-up of pressure that forces the liquid out through the pores. This liquid is thought to be a type of sap and appears red due to a pigment found within the fungus.

























